How about this?

Author: lhoguin

deps/rabbit/test/feature_flags_SUITE.erl

@@ -268,6 +268,7 @@ init_per_testcase(Testcase, Config) ->
             Config2 = rabbit_ct_helpers:set_config(
                         Config1,
                         [{rmq_nodename_suffix, Testcase},
+                         {secondary_enabled_plugins, "my_plugin"},
                          {tcp_ports_base, {skip_n_nodes,
                                            TestNumber * ClusterSize}},
                          {net_ticktime, 5}

deps/rabbitmq_ct_helpers/src/rabbit_ct_broker_helpers.erl

@@ -193,12 +193,10 @@
     tcp_port_mqtt_tls,
     tcp_port_web_mqtt,
     tcp_port_web_mqtt_tls,
-    tcp_port_web_mqtt_examples,
     tcp_port_stomp,
     tcp_port_stomp_tls,
     tcp_port_web_stomp,
     tcp_port_web_stomp_tls,
-    tcp_port_web_stomp_examples,
     tcp_port_stream,
     tcp_port_stream_tls,
     tcp_port_prometheus
@@ -537,18 +535,10 @@ update_tcp_ports_in_rmq_config(NodeConfig, [tcp_port_web_mqtt = Key | Rest]) ->
     NodeConfig1 = rabbit_ct_helpers:merge_app_env(NodeConfig,
       {rabbitmq_web_mqtt, [{tcp_config, [{port, ?config(Key, NodeConfig)}]}]}),
     update_tcp_ports_in_rmq_config(NodeConfig1, Rest);
-update_tcp_ports_in_rmq_config(NodeConfig, [tcp_port_web_mqtt_examples = Key | Rest]) ->
-    NodeConfig1 = rabbit_ct_helpers:merge_app_env(NodeConfig,
-      {rabbitmq_web_mqtt_examples, [{listener, [{port, ?config(Key, NodeConfig)}]}]}),
-    update_tcp_ports_in_rmq_config(NodeConfig1, Rest);
 update_tcp_ports_in_rmq_config(NodeConfig, [tcp_port_web_stomp = Key | Rest]) ->
     NodeConfig1 = rabbit_ct_helpers:merge_app_env(NodeConfig,
       {rabbitmq_web_stomp, [{tcp_config, [{port, ?config(Key, NodeConfig)}]}]}),
     update_tcp_ports_in_rmq_config(NodeConfig1, Rest);
-update_tcp_ports_in_rmq_config(NodeConfig, [tcp_port_web_stomp_examples = Key | Rest]) ->
-    NodeConfig1 = rabbit_ct_helpers:merge_app_env(NodeConfig,
-      {rabbitmq_web_stomp_examples, [{listener, [{port, ?config(Key, NodeConfig)}]}]}),
-    update_tcp_ports_in_rmq_config(NodeConfig1, Rest);
 update_tcp_ports_in_rmq_config(NodeConfig, [tcp_port_web_stomp_tls | Rest]) ->
     %% Skip this one, because we need more than just a port to configure
     update_tcp_ports_in_rmq_config(NodeConfig, Rest);
@@ -779,16 +769,17 @@ do_start_rabbitmq_node(Config, NodeConfig, I) ->
                         case UseSecondaryDist of
                             true ->
                                 SecondaryDist = ?config(secondary_dist, Config),
-%                                SecondaryEnabledPlugin = case filename:basename(SrcDir) of
-%                                    "rabbit" -> "";
-%                                    SrcPlugin -> SrcPlugin
-%                                end,
+                                SecondaryEnabledPlugins = case {?config(secondary_enabled_plugins, Config), filename:basename(SrcDir)} of
+                                    {undefined, "rabbit"} -> "";
+                                    {undefined, SrcPlugin} -> SrcPlugin;
+                                    {SecondaryEnabledPlugins0, _} -> SecondaryEnabledPlugins0
+                                end,
                                 [{"DIST_DIR=~ts/plugins", [SecondaryDist]},
                                  {"CLI_SCRIPTS_DIR=~ts/sbin", [SecondaryDist]},
                                  {"CLI_ESCRIPTS_DIR=~ts/escript", [SecondaryDist]},
                                  {"RABBITMQ_SCRIPTS_DIR=~ts/sbin", [SecondaryDist]},
                                  {"RABBITMQ_SERVER=~ts/sbin/rabbitmq-server", [SecondaryDist]},
-%                                 {"RABBITMQ_ENABLED_PLUGINS=~ts", [SecondaryEnabledPlugin]},
+                                 {"RABBITMQ_ENABLED_PLUGINS=~ts", [SecondaryEnabledPlugins]},
                                  {"RABBITMQ_FEATURE_FLAGS=~ts", [?REQUIRED_FEATURE_FLAGS]}
                                 | ExtraArgs4];
                             false ->