BB Curve :: How To Map The "answer The Phone" Function

BB curve 8520. The green phone icon space under the screen is what I press to answer the phone. It only works once in a while. Always been that way. As a result, I hit it, bring the phone up to my ear and have the phone ring in my ear. Today was the last straw. 90 minutes later and I still have an ear ache. I can see I am not a candidate for a touch screen phone any time in the future.

I have been looking all over the web and tinkering with the phone. I'd like to get the convenience button, the trackball button or a key on the keyboard to enable me to definitively pick up calls.

The documentation indicates I can map the convenience button to a function like the calendar, call log, or other app. I'd like to map the "answer the phone" function to the convenience button so I have tactile feedback that I have answered the phone.