Have you explored the WAB (Work Area Bar)? That limits both Renders, and also many Exports. Here is a look at the WAB from PrPro 2.0, but other than some colors, CS5 will act the same:
If you wish a keyboard shortcut, I would file a Feature Request for such.
Thanks for the tips ..
Any idea on how to add it to the Control Pop-Up Menu?
I don't believe that's possible.
If you're rendering so much, it may be time foe some better hardware.