Some other clever hacks "exploited" by Jews over the years:
* Say a door needs to be opened by a button. For some reason which I can't quite remember right now, you can't just press the button to open the door, but say that after you press the button there is a random wait befroe the door is opened, then it's OK.
* You can't light fire on shabbat and, by some logic, that also means you can't close an electrical circuit. But say you have a door that requires a keycard to open. You can't put the keycard next to the reader because that will cause a circuit to close but if you were to press a button that turns off the card reader for some random amount of time (which is OK) and then just happen to put your card in range, when the reader turns itself back on it will recognize your card and open the door.
* You can't create permanent things on shabbat and that includes writing. But, say you have to write for some reason - you use a shbbat pan with ink that evaporates after several days (hence, is non-permanent).
There are lots of theese hacks, and even a whole R&D center dedicated to them[1] in Israel. Funny stuff.
[1] http://www.zomet.org.il/ (Hebrew)