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Since I couldn't use a dedicated key I opted to double tap the home key to launch the camera....I'm actually pretty happy with that.
Yes. That's what I meant a dedicated photo capture key. A button you can press to snap a picture. Guess there's not. Thanks everyone.i''m pretty sure that she meant a dedicated photo capture key, in which case, you're out of luck. taking pics certainly IS awkward.

I haven't tried this, but a quick google search gave me this app: Volume Key Camera Shutter.
If you want to try it out and report back. It seems like it doesn't work for a number of devices from the comments.
I can confirm this works on the atrix. Nice find. However, you have to use the app camera, would be nice if it modified the stock camera app to use the volume shutter feature. The apps camera has no features at all. No way to zoom, change res or anything
****UPDATE - after doing this, I decided to look into the settings of my favorite camera app and found that in camera ZOOM FX you can change the default volume key assignment to take a photo. MUCH better app than physical shutter!
So what is your favorite camera app?!!
John