Not sure. There is an "overdrivesharingscheme" modoption. It can be set to "Investment return" (default), "Overdrive return", "Extractor return" and "Equal sharing". I don't really know what the two middle options do.
Other than that the most you can do is control who your excess M/E go towards.
Remember that votekicking (new) players from public rooms for building the wrong things is not allowed unless they actively harm your team (roaching units, blocking factory exits, reclaiming everything, extreme intentional cases of metal delivery, etc.). If other players harass you with constant !kick commands you should probably report them.
