Maybe, yes. Although I'm pretty sure that map stealing is against the rules if you have proof of it then the person would probably get in pretty big trouble. On the other hand, it's your responsibility about who you let download your map and you should be almost certain that they won't just go and 'troll' in it. If it's just a single person ranting on about how it's their map, then I don't see an issue. Just block them. However, if they suddenly bring in a whole load of people and start their own roleplay in YOUR map, then I think it's a good idea to report. A kicking feature would be nice, but it's not absolutely necessary.