set g_mapConfigs "folder"
. Then make a folder in Tremulous\base called folder. In the \folder, make a file called default.cfg. Inside there, in your case, addset g_alienbuildpoints 1000
set g_humanbuildpoints 1000
set g_alienstage 2
set g_humanstage 2
3) Sorry can't help you with that.
3) Sorry can't help you with that.You have other guid, maybe reinstallation. OK, run server, connect with client to game and disconnect. Then look in to console shell, and near you colliding nick and ip is writed guid. The old guid in "admin.dat" under that colliding admin name rewrite with this new. Connect with client and admin name to game and done!
Also, I would lower the maxping to like 500 or even lower.