Boris Yanushpolsky recently blogged about a utility he wrote that allows you to disable or enable multiple rules, monitors or discoveries at once over on his MSDN blog. If you haven't seen it you might want to check it out. It's been out there a couple weeks so it may be old news to some of you but in case you missed it I think you'll find it helpful. As always with these kinds of things, Microsoft makes no warranties or guarantee's as to the use of this utility so use it at your own risk. You can read the article here.
Hope this helps!