diff --git a/unit_tests/falco/app/actions/test_configure_syscall_buffer_num.cpp b/unit_tests/falco/app/actions/test_configure_syscall_buffer_num.cpp
index 13288faf..ddbea31d 100644
--- a/unit_tests/falco/app/actions/test_configure_syscall_buffer_num.cpp
+++ b/unit_tests/falco/app/actions/test_configure_syscall_buffer_num.cpp
@@ -30,7 +30,7 @@ TEST(ActionConfigureSyscallBufferNum, variable_number_of_CPUs)
 	// not modern ebpf engine, we do nothing
 	{
 		falco::app::state s;
-		s.options.modern_bpf = false;
+		s.config->m_engine_mode = engine_kind_t::MODERN_EBPF;
 		EXPECT_ACTION_OK(action(s));
 	}
 
@@ -38,7 +38,7 @@ TEST(ActionConfigureSyscallBufferNum, variable_number_of_CPUs)
 	// default `m_cpus_for_each_syscall_buffer` to online CPU number
 	{
 		falco::app::state s;
-		s.options.modern_bpf = true;
+		s.config->m_engine_mode = engine_kind_t::MODERN_EBPF;
 		s.config->m_modern_ebpf.m_cpus_for_each_syscall_buffer = online_cpus + 1;
 		EXPECT_ACTION_OK(action(s));
 		EXPECT_EQ(s.config->m_modern_ebpf.m_cpus_for_each_syscall_buffer, online_cpus);
@@ -48,7 +48,7 @@ TEST(ActionConfigureSyscallBufferNum, variable_number_of_CPUs)
 	// we don't modify `m_cpus_for_each_syscall_buffer`
 	{
 		falco::app::state s;
-		s.options.modern_bpf = true;
+		s.config->m_engine_mode = engine_kind_t::MODERN_EBPF;
 		s.config->m_modern_ebpf.m_cpus_for_each_syscall_buffer = online_cpus - 1;
 		EXPECT_ACTION_OK(action(s));
 		EXPECT_EQ(s.config->m_modern_ebpf.m_cpus_for_each_syscall_buffer, online_cpus - 1);
diff --git a/userspace/falco/app/actions/configure_syscall_buffer_num.cpp b/userspace/falco/app/actions/configure_syscall_buffer_num.cpp
index 6df84d8f..aed2534c 100644
--- a/userspace/falco/app/actions/configure_syscall_buffer_num.cpp
+++ b/userspace/falco/app/actions/configure_syscall_buffer_num.cpp
@@ -23,7 +23,7 @@ using namespace falco::app::actions;
 falco::app::run_result falco::app::actions::configure_syscall_buffer_num(falco::app::state& s)
 {
 #ifdef __linux__
-	if(!s.options.modern_bpf)
+	if(!s.is_modern_ebpf())
 	{
 		return run_result::ok();
 	}
diff --git a/userspace/falco/app/actions/create_requested_paths.cpp b/userspace/falco/app/actions/create_requested_paths.cpp
index eae38154..5eba04ac 100644
--- a/userspace/falco/app/actions/create_requested_paths.cpp
+++ b/userspace/falco/app/actions/create_requested_paths.cpp
@@ -39,10 +39,10 @@ falco::app::run_result falco::app::actions::create_requested_paths(falco::app::s
 	{
 		// This is bad: parsing gvisor config to get endpoint
 		// to be able to auto-create the path to the file for the user.
-		std::ifstream reader(s.options.gvisor_config);
+		std::ifstream reader(s.config->m_gvisor.m_config);
 		if (reader.fail())
 		{
-			return run_result::fatal(s.options.gvisor_config + ": cannot open file");
+			return run_result::fatal(s.config->m_gvisor.m_config + ": cannot open file");
 		}
 
 		nlohmann::json parsed_json;
@@ -53,7 +53,7 @@ falco::app::run_result falco::app::actions::create_requested_paths(falco::app::s
 		}
 		catch (const std::exception &e)
 		{
-			return run_result::fatal(s.options.gvisor_config + ": cannot parse JSON: " + e.what());
+			return run_result::fatal(s.config->m_gvisor.m_config + ": cannot parse JSON: " + e.what());
 		}
 
 		try
@@ -62,7 +62,7 @@ falco::app::run_result falco::app::actions::create_requested_paths(falco::app::s
 		}
 		catch (const std::exception &e)
 		{
-			return run_result::fatal(s.options.gvisor_config + ": failed to fetch config.endpoint: " + e.what());
+			return run_result::fatal(s.config->m_gvisor.m_config + ": failed to fetch config.endpoint: " + e.what());
 		}
 
 		int ret = create_dir(gvisor_socket);
diff --git a/userspace/falco/app/actions/helpers_generic.cpp b/userspace/falco/app/actions/helpers_generic.cpp
index 44e205ed..2a199158 100644
--- a/userspace/falco/app/actions/helpers_generic.cpp
+++ b/userspace/falco/app/actions/helpers_generic.cpp
@@ -75,7 +75,7 @@ void falco::app::actions::print_enabled_event_sources(falco::app::state& s)
 				}
 				else
 				{
-					if (src != falco_common::syscall_source || s.options.nodriver)
+					if (src != falco_common::syscall_source || s.is_nodriver())
 					{
 						falco_logger::log(falco_logger::level::WARNING, "Enabled event source '"
 							+ src + "' can be opened with multiple loaded plugins, will use only '"
@@ -84,7 +84,7 @@ void falco::app::actions::print_enabled_event_sources(falco::app::state& s)
 				}
 			}
 		}
-		if (!first_plugin && s.options.nodriver)
+		if (!first_plugin && s.is_nodriver())
 		{
 			falco_logger::log(falco_logger::level::WARNING, "Enabled event source '"
 				+ src + "' will be opened with no driver, no event will be produced");
@@ -126,4 +126,3 @@ void falco::app::actions::format_plugin_info(std::shared_ptr<sinsp_plugin> p, st
 		os << "  - Async Events" << std::endl;
 	}
 }
-
diff --git a/userspace/falco/app/actions/load_config.cpp b/userspace/falco/app/actions/load_config.cpp
index ebfb203f..fb140e93 100644
--- a/userspace/falco/app/actions/load_config.cpp
+++ b/userspace/falco/app/actions/load_config.cpp
@@ -27,6 +27,10 @@ using namespace falco::app::actions;
 // applies legacy/in-deprecation options to the current state
 static falco::app::run_result apply_deprecated_options(falco::app::state& s)
 {
+	// Please note: is not possible to mix command line options and configs to obtain a configuration
+	// we need to use only one method. For example, is not possible to set the gvisor-config through
+	// the command line and the gvisor-root through the config file.
+	//
 	// If overridden from CLI options (soon to be removed),
 	// use the requested driver.
 	if (getenv(FALCO_BPF_ENV_VARIABLE))
diff --git a/userspace/falco/app/options.cpp b/userspace/falco/app/options.cpp
index e6d07c4f..32ea07ec 100644
--- a/userspace/falco/app/options.cpp
+++ b/userspace/falco/app/options.cpp
@@ -39,7 +39,8 @@ options::options()
 	  markdown(false),
 	  modern_bpf(false),
 	  dry_run(false),
-	  nodriver(false)
+	  nodriver(false),
+	  trace_filename("")
 {
 }
 
diff --git a/userspace/falco/app/state.h b/userspace/falco/app/state.h
index 226772c8..ba6caee5 100644
--- a/userspace/falco/app/state.h
+++ b/userspace/falco/app/state.h
@@ -155,6 +155,16 @@ struct state
         return config->m_engine_mode == engine_kind_t::GVISOR;
     }
     
+    inline bool is_modern_ebpf() const
+    {
+        return config->m_engine_mode == engine_kind_t::MODERN_EBPF;
+    }
+
+    inline bool is_nodriver() const
+    {
+        return config->m_engine_mode == engine_kind_t::NONE;
+    }
+
     inline bool is_source_enabled(const std::string& src) const 
     {
         return enabled_sources.find(falco_common::syscall_source) != enabled_sources.end();
diff --git a/userspace/falco/configuration.cpp b/userspace/falco/configuration.cpp
index fe3b7dee..750519a7 100644
--- a/userspace/falco/configuration.cpp
+++ b/userspace/falco/configuration.cpp
@@ -122,7 +122,7 @@ void falco_configuration::load_engine_config(const std::string& config_name, con
 	}
 	else
 	{
-		throw std::logic_error("Error reading config file (" + config_name + "): wrong engine.kind specified.");
+		throw std::logic_error("Error reading config file (" + config_name + "): engine.kind '"+ driver_mode_str + "' is not a valid kind.");
 	}
 
 	switch (m_engine_mode)