I had an idea this morning... put little plastic stickie bumps on the screen over common buttons.... like the volume up/down or the audio/info popup buttons. Years ago, I saw some iphone cases that had molded buttons that lined up with the on screen keyboard effectively making it easier to feel the keys.

I know such things have to exist, I can't find them online though.... any ideas? Getting tired of taking my eyes off the road to look for an onscreen button that I could just reach out and touch.

 

A clear piece of scotch tape can be formed into little bumps as needed and still mostly transparent and free if you have it.