The old RTV settings were:
-After 10 MINUTES is rockthevote allowed.
-When 60% of the players said rockthevote then comes the mapvote.
-When 8 players said rockthevote then comes the mapvote.
-After 15 seconds the voting is over and the server change the map.
As for RTV, i believe it pulls maps from the mapcycle.txt that is on the server. I may be wrong but i dont think you can change that. Liam would probably have a better answer.