I think instead of looking into a Promod, we could use this opportunity to propose/code some community changes, with the hopes Valve may push it into the game at some point. Valve don't seem to mind pushing community fixes as long as they don't have to do it themselves.
Think big! We could push our proposals for fixing Competitive matchmaking, weapon buffs/nerfs, other balance changes. I know from a production/casting point of view, there's some changes I'd love to see in the spectator client, especially things like adding smooth lerp commands like the CS:GO build had to make those nice cinematics.