Edit permissions of multiple roles at once.

This has probably been said a few times before but imagine this. You've created a server and you've got heaps of roles. Let's say 35 roles. You need to change a certain permission for 20 of those roles. Oh, the pain of having to change that permission individually. Having to do the same thing 20 times. Wouldn't it be much easier to simply select multiple roles? That way you can change permissions across multiple roles at the same time?