Look at tan1c_con for the clone sniper: should be something like rep_inf_ep3_sniper. It'll be in sides/rep.
A team deathmatch would require some fiddling. You can add it as another mode or just edit conquest so the capture regions are unreachable. For adding a mode, check out the
How to Add Hunt Mode tuto and just edit the script to a deathmatch-style one. (Which is basically Hunt.)