For powering my rack modules I’m using 2x8 connectors (and flatcable) so there are 2 pins free since 6 are used for -12 V, gnd(3), +12 V and +5 V.
I’ve been experimenting with using one of the remaining pins of the powerstrip to distribute a reset signal generated from a central module (Reset-O-Matic) with a ‘big’ reset button on it.