hmm the tax/ fine i think you can only judge that if its finisht. Not sure how you want to do that. but if its like /fine <player> <amount> but what if he doesnt pay then?
maybe an idea to make the bases and planets only dockable for those with access? I know in discovery there are such options only clans can enter some bases who are on an enter list. so you can choose if peeps may dock at your system's bases or not. (like if bs, trains etc could dock)