Veto system could be faster if the map didn't load before vetoing. You would first see the map and gametype, and the map could load while the veto timer is counting down. Then, if it gets vetoed, a new map could pop up.
Reloading should be toggle-able in custom games. If you play with infinite ammo, why not have the power to not have to reload?
In terms of maps, I would like to see exact remakes of Midship, Sanctuary, and Warlock. Foundry was a good forging map, but could we just have a box next time?
Shaping hill/territory markers would also be cool. Like placing corner markers for a hill and have a unique hill shape.
Also, Forge would be a lot better with 45 degree snapping. It would save countless hours of making sure a map looks perfect. Many people already know the Forge glitches (interlocking, floating, etc.) and doing the glitches without starting a new round or ending the game would make it less annoying.