If you can modify a slot machine, what add-ons would you put?

Question

If you can modify a slot machine, what add-ons would you put?

Answer 1

Instead of having a drink lady who comes around every hour to give you a beer, have a tap right on the machine that dispenses free beer. I would spend a lot more time playing slots at that machine.

Answer 2

I'd like them to automatically detect me and pay me the jackpot any time I put a $50 bill into one.