Hello @futz
1. No, there are no bugs in switching server. You are safe to do.
2. Your cooldown starts when you switched servers, and it is for 30 Days, however if you wish to transfer before the cooldown reset, then 100 coins will be charged for it.
3. Yes, it can be done my any moderator. You have to make a request for it.
4. Sorry, I don't know about it.
Regards.