It's not your computer, though. If they want to host your game and do you a favour, you're doing a good job at discouraging them from doing so. Assuming I came into some good money and started getting some hosting arrangements going, I can say flat out that I wouldn't host a game that allowed a game developer free reign over the game on my server, as this would give them the ability to crash my server, disrupt my computer, or do various other things that I wouldn't like.
The knife cuts both ways -- there can be good hosts and bad developers out there. I'm not specifically saying that you are, but what if you hire someone on your staff who acts nice but occasionally goes on fits of destruction, and flatly denies it any time someone accuses him of it? Who are you going to trust, some lowly "host" or one of your trusted "staff"?
If the developer owns the game they have the full right to terminate your hosting ability and or suspend you from game play. As for the other stuff you mentioned the developers usualy take precautions to make sure that doesnt happen ,
Last I recall, a security fix had the programmer no longer able to access any directory outside of the games natural folder on the hosts hard drive. If that really is the case, your security issue response just flies out the window right there. I'm not sure though, I -think- I read that in an update somewhere.