I've had two BE-76 training planes with a Hobbs wired in a funky way. The first was at Sierra Academy (blah... talk about a ripoff!). Their hobbs was off the right engine. So we did almost all our single engine stuff with the right engine shut down. Another was N99UC, whose hobbs was wired into the Master Switch..... and would add another .1 or .2 to the flight time because my stupid instructor liked monkey-*ick around with the master on during preflight. What a jerk.
Anyway... just my little rant