Reliable Screen Lock?

[KJMiller]

I have searched for a bit and seen a few that people have argued over the merits of but none seem to do specifically what I want.

Is there any applications for the Diamond (I use Sprint if it matters) that will keep me from answering and hanging up on calls as I fumble in my pocket for the phone? I used that Slide to answer one for a while but the main answer and hangup buttons still work and I periodically answered or hung up on calls with it still, is there anything that requires some type of input done on the touchscreen to answer/refuse that also blocks the function of the physical buttons that would normally do the same??

Thanks!
-K