no problem, its kinda silly that pioneer did this, as SD cards are cheap ways to store a lot of media.
a very good alternative would be to just get an ipod to store videos on, that you could access from the touch screen but watch on the rear monitor.
dont even have to be a lot of money, you could always buy an older used ipod for cheap, then just leave it in the glove box connected.
also jeff, i have not seen any one yet modify their system for this functionality, my bet would be that it is a hardware issue and not software, so it probably cant be done by just adjusting the software...
i believe that you would have to modify the hardware to get this to work and at that point, it would just be easier to buy an ipod for it
DISCLAIMER:
i am not an Apple fanboy, i really do hate a lot of things they do. so every time i do recommend buying an ipod, a little part of me dies inside. but at the end of the day, the level of integration they have with everything else ever build just makes using them too easy to keep hating.