First I want to thank everyone in this thread for helping me build my PiTop.
If I'm not mistaken no-one has proposed a solution to the power-reset upon closing the laptop display which doesn't require additional power supplies. If anyone is interested, there are three magnets under a metal cover under the bezel which surrounds the display on the lapdock: one on each side which help hold the display shut ( there are matching magnets in the base ) and one on the right side of the center which is matched by a Hall Effect sensor ( it has been asked a few times what exactly senses the display closing ) which is located on a board under the trackpad of the lapdock.
This leaves you with two (obvious) choices to ameliorate the problem: pry off the bezel and unscrew the metal cover to remove the magnet, or pry open the base to short the proper terminals to prevent sensing of the magnet altogether.
Both methods work flawlessly, each with their drawbacks; that is, neither is the easiest thing in the world to do. Removing the magnet left a few subtle stress marks on the plastic cover of the display, and there are 6 or so screws to be removed and replaced, while keeping the other two magnets in place.
The other method requires you remove four screws from the bottom of the base ( two in the center, two covered by rubber stops closest to the trackpad ) before unsnapping the top and bottom halves of the base, and removing a metal cover holding a long thin board. On the right-most side of the board a small, square Hall Effect sensor with 3 terminals is soldered on. Shorting the positive and output terminals (the two terminals which are on the same side) should give the desired effect, although we unsoldered the whole sensor as well. Be sure all ribbon cables are still connected before closing everything up ( or you may be opening it back up rather soon to regain use of your keyboard and mouse )
I hope someone finds this information useful, and I'm sorry that I have not pictures to post