The problem:
Whenever depositing minerals without using auto sell, it can be very annoying to have to manually click the specific mineral hundreds or even thousands of times for each type of mineral. When trading, It is equally annoying to have to click each material (or whatever the item type is) when one is selling items in bulk.

Possible solutions:
Primary mouse button opens a window asking the quantity the player wishes to specify.
Primary mouse button adds 1 of the chosen item; secondary mouse button opens previously mentioned quantity window.
Primary mouse button opens a window listing several quantities along with the option to specify a custom amount (1, 10, 100, 1000, specify)

I'd assume it would be an easy implementation, and would be a great addition to an already wonderful game.

Thanks in advance
-Ragbash