I really like the system of score tracking and notifications for assists that happen on Rageball now, though I think sometimes it can crowd the screen too much showing what everyone is doing.
After playing with all these great additions though, I had an idea that's been mentioned a few times in this thread, and I do think is really good. To supplement whatever the team reward will be for winning (which I think should still be the primary method of experience gain), along with proximity kills (something I honestly don't like very much at all) it would be fantastic if the devs implemented situational, objective/support based rewards, especially if the kill log notified you (and only you!) of what you did. And to have all of these little bonuses go into a pool called "points" like in TF2 I guess or similar games, that would at the end be converted into round/map bonus experience. This should be the reward for individual play, instead of going by kills. Cuz goddamn, I power level fast enough rolling multis when I am a cav player, that would just make it aggressively more imbalanced.
For example, a buff to objective play on siege would be getting a few extra points when you kill an attacker who was capturing the flag, or vice versa. Wall defenders/attackers would get proximity experience, and flag defenders/attackers would get these, keeping things in parity if possible and balancing the gametype. And it won't be so awful of a feeling to defend the flag in an epic back and forth for the last 2 minutes, only to lose, cuz of all the points you'd have gotten.
There's probably a million things you could think of for the battle servers, but a few examples would be dehorsing a cavalry player, headshots, support damage, going on a killstreak in a short time period, inflicting most overall damage (maybe not, because ya, cav lol), maybe even saving teammates about to die if that was possible. If this stuff could be tracked live on the server, I have no idea if it does this or not just know that you guys can pull out the stats to evaluate balance (while ignoring NA), everything should definitely be reduced for cav players to compensate for their speed bonuses and overall cheesy OP gimmick style of play.
You guys definitely need to be very careful if you decide to go with proximity death EXP, as it can be fun to watch it go up all round and all and people can say it "rewards teamwork" but honestly all the maps and matches from that era more often then not deevolved into gimmick exp grind camping of awful places in maps or just bad maps in general (exp bridge, exp barn for quick examples), devalues skirmishing or cavalry player's points compared to their contribution, and just never really seemed that good to me to begin with. Either do it globally (or close enough) or not at all.