I would like to make a slight suggestion to world guesting.
When you choose what world you would like to guest, it pops out question if you are sure about it.
It would be nice, that this warning pops out only 1st time when you try to guest and after locking guested server (litle lock or something similar to that near world name) it doesnt do that.
Its quite annoying everytime you guest to already locked server you have to acknowledge you are guesting (since you already know that u do)