I intentionally sabotage my own work during rough-in to insure my return to trim out.
I always pigtail the hot & neutral in a box for each general-purpose circuit somewhere (usually a switch box). When I make up that box, I put an orange wire nut on the black & white, creating a dead short. No twisting them, just connect with the wire nut.
When I return to trim, the orange wire nut gets removed, and the wires seperated. Both wires are capped, then trim as usual.
If, however, the HO does exactly what DRG says, guess what happens? As soon as he turns on the power, BOOM! And who's he gonna call? Me.
"Well, Mister Homeowner, our contract is for a complete job. If you want to pay me the remaining balance, I'll be more then happy to come out and complete the work. Oh, and by the way, I'm going to charge you our normal service-call rates to verify the things you did to my work are not hazardous. This can be very time-consuming......."