Custom Game Settings;

Separate Teams options;
-- Separate team health values
-- Separate team speed values
-- Separate team damage values
-- (read the weapons options idea, it ties into separate team options)
-- Separate team money values (Multiplier (per round) and starting cash)

Examples of what JUST these changes can do for custom game-modes.

Add extended ability for hide and seek modes, add the ability to replicate (to the best of breachers ability) The Hide from Pavlov, juggernaut game-mode, and any other game-mode possible with the already implemented systems.

General Ideas;

Add an infection option, one team has the "infected" tag, this team is the infected team and is the ONLY team that killed players can revive onto.

Uncap team limit (server limit remains) so we can have say a 3v7 or a 1v9.

Add a slider to add or remove equipment slots PER TEAM, one team can have 0-1 equipment slots while the other can have up to 5 (max).

Add per player equipment limits instead of a team pool as a setting. Each player for example can have 2 flashbangs, but no more. No pool to take from.

Add an option for unlimited Equipment duration, the cloak and drone for example, they last forever. Add this per equipment so you cant add an incendiary grenade that lasts the whole game.

Add an option for per gadget damage, the static field emitter does more damage, the grenade does 50 hp, the trip mine does 999 damage but the incendiary grenade does 1 damage (tick). etc.

Add a toggle option for unlimited equipment. NOT the one already in, as that lets you have unlimited CAP. But instead, once its on your chest its ON your chest. For example, grabbing a grenade will visually grab a grenade but there's still another in the slot you just grabbed it from, with an option to de-spawn equipment from the slots once they hit the floor (to avoid server abuse).

Weapon Ideas;

Add per weapon settings. Limit what attachments can go on what guns (add a little gear icon in the upper right corner of each gun setting in the custom menu, allowing full customization of damage, rate of fire, ammo, allowed and banned attachments, etc.)

^^^^^^^^^^^^
This is per team too, not global.

And finally, add an in-game browser that custom game-modes can be uploaded to for other players to use. Upload custom game-modes, then players who don't want to go through the immense effort of making and testing game-modes and just want a one-click setup without hunting public lobbies for good settings to save.

To avoid spam, add a simple system to detect profanity/spam and remove it from the pages, and add a limit of 5 game-modes uploaded per person.