Simple and brief. The 5000tc tourney is always ABD. Rotate the mod once in a while to make it more interesting. To mods like lenshung3, erthtkv2, greykido etc.

why not just changing the mod every month ?

They can use the information collected from the competitive mod survey to decide which mods?

well, in my opinion each of winners of mod survey deserves 5k tourney room. just 3 rooms with the best mods of each style.

This would be a great idea for players that are skilled in certain mods and want to make some tc from that instead of just abd

Great idea! 10/10
just make sure its not too strict, so that people can still play instead of them being half empty all the time