This project takes it in a interestingly different way: adding controls onto the display to give physical control to touch areas.
“So, how do they work? You take your iPhone, and boot up your favorite game that makes use of onscreen buttons. Slap one of these buttons on top of the onscreen button you’re looking to replace, push down, and bam! The Classic should hold in place thanks to a “special micro-suction cup material imported from Japan”, which they’re promising should stick and re-stick without leaving a mark.”
Link: Joystickers: For When You Wish Your iPhone (Temporarily) Had More Buttons (mobilecrunch.com)