Since it's so easy why don't you suggest it directly to B&N? I'm sure they would be more than glad to have you implement it for them.
I'm surprised this feature was not added in the recent 1.2 update, which really seems to be fairly minimal in terms of new features.
Show me an update for the NST that wasn't. In fact, show me an update for the NST that didn't eliminate features, didn't break anything or wasn't a fix for something a previous update broke.
Merc, you have to also keep in mind that the screen refresh rate on e-ink displays is VERY VERY slow. The user experience wouldn't be very pleasent.
B&N seems very focused on keeping the NST a "reader" and not a "baby tablet" with all sorts of apps. I can easily add library books using my computer and it's a LOT faster than waiting for screen update after screen update.