A new idea for reaper - macro markers
Ok, i just thought about this one. Hasn't been done in any other DAW to my knowledge.
How about having an actions/macros marker facility. An example scenario :
Insert action marker at 09:01:01. Click on "activate action markers" in the edit menu. Open the marker (dbl-click) and insert macros and actions.
Now play the song and watch what happens. At 9:01:01, the macro that i inserted in the marker will be executed.
What's the purpose? You can fully automate any session in reaper.