Works, in the sense that it does change the game-mode.. However, there are many bugs with it.. I've only tested it with bots so far. Every time you change the game-mode, it adds a couple more bots (to both teams if it's a team-game). Not sure if it would add bots if you were playing an online game?

When I changed to DM from a CTF game..I changed into DM colours, and it added a few extra bots in DM colours.. Yet the bots that were already there remained the same, and the ones that were on the same team could not kill each other.. I'm pretty sure the same thing happens if you change from INF to DM, and so on. If you change from DM to CTF, teams are formed.. however the extra bots that come (unwanted) are in DM colours...

Ye i tried changing from htf to ctf there's still that yellow flag. And if you are in red team and pick it up it says "U got the blue flag" (Can't score with yellow one thought :D)
Really buggy...