Just a thought I had. I use Droppers often for transporting items, and I've seen a few other servers have stack dispensing. I think it's a small but pretty cool suggestion. Let me know your thoughts!
There are many ways to more efficiently transport items; especially a water stream pushing items into an old school item elevator. Making dispensers shoot stacks of items would also break many Redstone contraptions that use droppers/dispensers. It's a no from me.
What if there was a sign you could put on the dropper? Like [Stack] and then only that dropper would drop a whole stack at a time.