I think it wil stay NO because we only hear about printer sharing trough airport & the other wifi usbcontrolling device from pc manuacturors allso are only printerservers... there is allso no software controlling it on an network (scanners I mean) unlike printers where you can add things into the waitinglist on the networkprinter... just send your command first come first served...
I have another Idea (a bit silly I guess) get an old mac wich is just fast enough for scanning and you only put macosx and the scansoftware on it... thus keeping the rest of the drive free for images...
then install remote desktop on all the other computers in the network
thus giving everybody (not all at the same time offcourse) acces to that computer to let it scan
as I said a bit weird setup and not very workable... but since someone has to be at the scanner to feed it with subjects why would you want to control it over anetwork? printers are fine that way they only complain when the ink is low or paper empty, for the rest put them in a corner and pick up the prints whenever they're finished...