Looking to only allow paper for instance to be stored only in the Tool Cupboard. I thought adding an item with maxstacksize = 0 would do this however that allowed stacks of 1 and when i tried to remove the item i was kicked for RPC Error in MoveItem

This plugin was never intended or designed to block items out of a container. It only allows for different stack sizes for specified items in specified containers.

I only support container re-sizing on a limited selection at the moment. ( Large chests, small boxes) it will work on others, but it will break things like
( tool cupboard UI )