@ 1 + 2... Get anything but a tosti-bah notebook That's not the spot where they all have them. (edit: by the way, that doesn't solve the heat problem on the bottom of notebooks)
@3: It's true... It could be done... But fans aren't designed to run both ways... They simply do not work efficiently at all if they're turning the wrong way. Second is that the mainboard operates on direct current, and the fan is connected directly to the power outlet... It would require a seperate power converter to make it turn both ways... Which requires room, which is in short supply in a notebook. Especially if the fan is not going to work properly running one of the ends.