Stop talking about vote kick or report.
Vote kick can only be done after 5 mins, and generally fail.
The GM don't care about reports for leeches in frontline, and we can't blame them : both the players and GM have better shit to do than reporting and investigating leeches. The only true solution is better design.

Frontline needs some small performance requirement to earn the reward, to discourage leeches and griefers. The designers know the skills, they know how frontlines play out, and they probably have some statistics about how players do, so they can do their designer job and have an opinion about an acceptable minimum performance.