We can't "make" it a sniper server. Apart from naming it one and having sniperish maps. That's been done.
It's more about what maps and gametypes.
If we leave the voting on then it's moot, we can vote a change if we don't want the map or gametype that rotates in.
Alternatively, we could change the TDM server to voting, and make S3 a 24/7 wallhouse, errr, Killhouse. If we leave it for a month or so it may get popular.