officially allow for forming groups/teams, e.g. paramilitary groups. That would then call for a top damage list per battle where you would see which group/team did how well. Battle Hero GROUP, not just one ego being best, but teams in "competition".
Should be a rather easy to implement thing. There must definitely be an admin of the group and nice-to-haves could be a finance, logistics, information, intelligence officer. Somewhat similar to governments, but let´s keep it simple.