I'll buy a Mr. A, split it unto Uncle B's, and ascend (tomorrow) so I can see the URLs for this. "The way you can with Mr. Accessories" is, if I recall, "pull exactly one at a time"; I don't think there is a "count" field. I bet that there IS one for the Uncle B pulling, though; I don't think I'd enjoy pulling all 10 of them one at a time so that I can combine them back into a Mr. A for the upcoming IOTM...February 26 - Mr. Store now lets you pull Uncle Bucks out of storage the way you can with Mr. Accessories.
The Coinmaster Frame could do that automatically (prompt for quantity and do as many requests as needed). That frame is what needs to change in order to accommodate this trivial update.