I don't know if the suggested replacements for the kills are the best, but they're certainly a start.
They encourage and reward the behaviour the server wants to encourage and reward.
The current kill quests are opposed to the RP the server wants, incentivising everything from Rambo assaults on enemies, Rushing to other Reg's battlestations by meta gaming the kill feed, not commsing in hostile locations and not attacking enemies until they get low enough for a kill steal.
Frankly, I don't understand why there isn't a reward for being ECs. In fact it's the opposite, you can't get EC kill