Try these settings:
- {l Code}: {l Select All Code}
sv_modelockfilter 4 // Limits modes to only Deathmatch
sv_modelock 6 // Restricts voting non-limited modes to admins only (in this case, anything other than Deathmatch)
sv_mutslockfilter 72 // Limits mutators to only duel and instagib. (use 328 to allow Arena as well)
sv_defaultmode 2 // Server defaults to choosing Deathmatch
sv_defaultmuts 64 // Server defaults to choosing Duel
sv_rotatemode 0 // Don't rotate GameModes when server picks
sv_rotatemuts 0 // Don't rotate Mutators when server picks
Unfortunately, that wont get you exactly what you want, because anyone can deselect duel when they vote. If you want it to always be duel no matter what, you will unfortunately have to disallow voting entirely.
However, you
could achieve this with some effort. If you set your server to be Open, thus allowing a Helper, you can allow only Helpers to be able to vote, and they can see if others on the server want insta or not, and can set the mutators accordingly.
In an open server, anyone can claim Helper by pressing F5 (or using /setpriv 1).
Keep things like varslock set to something higher than 2 so that Helpers cannot change vars, and modelock to something higher than 4 for the same reason. If you'd like to take this approach, in addition to the settings above, also set:
- {l Code}: {l Select All Code}
sv_votelock 4
Still not the most ideal solution, but somewhat close. Good luck with your server :)