I'm thinking a PIN Cracker that tries X amount of times per hour (between 1-5 times, 5 would disable the PIN feature for an hour though(?)) just so everyone has something to work with until another exploit is leaked on PIN cracking.
Nah, actually I'd make the program quite stealth-y like. It would login, try PIN's X times, then stop browsing (without logging out so other person won't get logged out) and continues after an hour or user set time, and so on.
The only way the person would get suspicious is if you leave it running and trying every hour, and it logs them out?
Ive seen someone mention it before, but a program that fill your shop and keeps it in check (Make sure it has all the items on a list and x amount of each) Like those huge Malls o;