I was thinking about this this today and I had a thought. With a little
effort the bottom could be made into two uncommited 'power planes'. One most
of the space between the rows of pins, the other a ring around the outside.
Then add pads for two surface mount parts to each pin, one to each plane.
With some care it could be setup where a solder bridge can connect any pin
to either of the 'power planes', pull up or pull down resistors could be
added to any of the pins (or fixed voltage dividers if you added both) or
bypass caps. Lot's of flexibility without adding cost.

-Denny
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