For the alt-tab (and alt-F4) issues, I discovered a different solution, AutoHotKey (http://www.autohotkey.com/). It's a free, open-source utility for Windows that will let you automate almost anything by sending keystrokes and mouse clicks. I discovered it after hitting alt-F4 while I was tanking a boss in Dragon Soul (my group was *not* happy with me).
It was pretty easy to set up, and although I'm only using it for un-mapping alt-F4 (so it does nothing!), it has lots of potential.