Thanks for the help, but I still think this option should be added.
Let me clarify as to why.
What you said will work, but still, it's not apparent to people to know that they can do this. If it was actually in the options and it was easy to switch back and forth between users, I think it would be something that would be used a lot by many people, but as it is now with the current method, only those with the knowledge of how to do it will do it. Especially for those people who don't want to script anything for their chat client or create custom shortcuts. (you'd be surprised by how fickle most people are when it comes to computers. The moment you mention anything other than 'double clicking an icon' their brain explodes. I've seen it happen, and it is not pretty.