Just a couple ideas:
I have our drawer set up to open only for cash transactions. Also, the z-out report gives you the number of times the drawer was open - and it seems to list only instances other than cash transactions. You could monitor drawer openings.
You could set Security to not allow anyone below a certain level to Clear a sale, and just review all open sales at the end of the day.
I left the Menu bar off for quite a while, too, but eventually wanted those functions too badly.
It goes without saying, but it sure is a shame to have to orient things like this around the possibility of someone taking advantage of it! I really like the options this system gives us, though.