I think it would be cool to have an autostack (on right click to try autostack item to already opened container)
my other suggestion would be to significantly extend the stack quantities. It not only help the clickfest, items organization for players, but it imho relieve the server load very much.

to have three 50 item baskets only to store one type of fur must take hard on server for example and this could take only one slot in one basket alltogether.
another thing comes with this when moving from large stack, shift pressed or something should allow split.