Make setting input/output amounts for processing patterns more intuitive

[Speiger]

Describe the feature

Honestly it is nice that JEI support is provided with pattern encoding. But GOD forbid you need stacksize included. Yes middle mouse click exists to define stacksize. (Found that out after i started writing this) But this is not a "good/intuitive solution" Especially since there are mice out there that still don't have mousewheels or more then 2 buttons.

Anyways a rule of thumb i saw with mods was: Leftclick => reduce stacksize (shift clear) Rightclick => increase stacksize (shift => double)

It would be really nice because it is really intuitive.

Reasons why it should be considered

It is really nice quality of life and rather easy to implement since all the data is already provided in the "click/slotclick" function to implement it.

Additional details

No response