:shock:
I would think that during a long shut down the oil would seep out through the bearing clearances and then the next time you start the engine up you wouldn't have pressure until the 'Oil Reservoirs' are full again. Bye bye bearings!! #-o
Not to mention that ten gallons of oil sitting there isn't going to do any good unless its under pressure.
Adding places for internal oil leaks are never good also. Maybe impossible to balance a crank or a crank to stay in balance with a 'Oil Reservoir' in the crank throw.
Moroso sells a oil accumulator that does the very thing you want. http://www.lingenfelter.com/store/mor23900.html