Motorola Droid - App to program key to end call

Motorola Droid's proximity sensor does not always allow the screen to come back on while on a call if you need to access the on-screen icons for "end", "dialpad", "add call", etc....

It would be great to have an app that would allow you to always be able to end the call by hitting (just as an example) the Home button.

Alternatively, an app that would allow for the choice of disabling the proximity sensor altogether would be equally helpful so that the screen is always available for entering extension #s via the dialpad, or simply ending the call.

Thanks!