1) You should not be able to stand at your spawn point and peg people with ranged weapons or mag abilities. Plain and simple. It's a cheap tactic exclusive to ranged fighters and can be used to mop up kills.
Which leads me to my second request.
2) The kill should go to the person who has done the most damage to the target. While I do enjoy snaking 2 or 3 kills with a well placed dawnbreaker I believe the game would more evenly reflect the skill of the team if kills were scores off of who actually put in the work.
3) This is just an idea since domination is kinda boring. Add more enviro damage to this one so teams have to work to keep each other alive and can't just easily run from flag to flag. I'm envisioning mechanics similar to the spinning blades that would pop up around flags. Right now that mode is just lacking. Either that or maybe require flags to be held for a certain amount of time, or something where it's a fight for whoever holds one flag the longest so they'd have to hold off the apposing teams and the offensive teams would need to decide how to dispose of the defenders and other attackers. Just spitballing here.