You're all missing the fact that you can go into "setup" in the main menu and then type in random letters in the password and click login....
Although yes, there should be a logout feature. but I have never seen any issues about logging into toribash on two computers with the same account(I have a lot of computers).
unless if say, you where trying to play multiplayer on the same account.. although I don't know if that would stop you as well.
Also having alternative accounts, as much as it is taboo, is not illegal here in toribash, don't compare it to LoL :P
Done some testing, you can't have the same account in one room for obvious reasons, but you can login to your account, and even play on multiplayer
in another room at the same time.
I then had a bit of fun...
TL;DR: Not an issue, but we should have a logout button non-the less. also you should really learn to untick "Remember password" on computers that don't belong to you :P Can't be to paranoid.