You can make them a member by using /is team invite <their username>. You can promote them with /is team promote <their username>, and you can change their permissions by using /is settings. :)
There are currently no resets planned as far as I know, but if you're talking about Survival, I suspect it might reset within the next few months. But, that's just my guess
Hiya, if you feel that your punishment was wrong, you are free to appeal it by going to this link. If you've already done that, then all there is left to do is to wait! Good luck :)