2. Write "rawfile,mod.arena" in mod.csv box in Launcher
3. In your main.menu (back up original first) find line ~269:
Change to this:
exec "set ui_gametype cmp; set ui_mapname "FIRST_PLAYABLE_CAMPAIGN_LEVEL
where yourmapname is obviously your map name. Idk why but mine only works when there's only a double-quotation mark before yourmapname, not after, so it looks like this
exec "set ui_gametype cmp; set ui_mapname "yourmapname
4. In pc_gamesetup_coop.menu (again back up original first) find line 66:
Comment it out. Then, if you want, change the index (first parameter) of all the next CHOICE_ options by -1 so there isn't a blank space where the game mode option is, but that's not essential.
CHOICE_DVARLIST_VIS( 1, "@MENU_GAME_TYPE", "", ITEM_TYPE_MULTI, ownerdraw UI_NETGAMETYPE textaligny 20, execOnDvarStringValue "ui_netGametypeName" zom "set ui_hostOptions 0; set ui_hostOptionsEnabled 0;";, 1 )
5. Save, then build mod twice.
Report back with any problems, I rushed so I'm willing to bet a better scripter will correct me but w/e ¯\_(ツ)_/¯