Yeah disabling the playerlist and toalls would be helpful. Some people could find it irritating to not be able to talk to everyone at once, or not be able to talk with their friends privately...
I'd kinda like it to be possible to modify the playerlist, like take out options. Such as taking out mass messaging only. So you can use it to private message people, but only one at a time. This will stop people from advertising their items and stuff via PMs.