One of the more time consuming, click requiring , is crafting gunpowder, clik done etc...
Why don t change the requirement for gunpowder?
Now a gunpowder require a mineral
The change that I suggest is : a 
new gunpowder require 3 mineral 
change obviously ammo and other crafting requirement 
now 12 gauge require 
6 gunpowder after the change (3 mineral for 1 gunpowder) 12 gauge will require only 
2 new gunpowder5 mm require 
3 gunpowder after will require only 
15 grenade require 2 junk a metal and 
5 gunpowder after it will require 2 junk a metal and 
2  new gunpowder etc...
This is more easily doable that the wished  x 5 key and will be less click click click in the game    

Or 
another (maybe better) 
suggestion is
with 5 powder 2 junk and 1 metal you craft 5 granade (you can t craft the single one)
change gunpowder to 
                                with 5 mineral you craft 5 gunpowder ... no change to other crafting required now
And please help the doctor too !
Change weak powder to  
                                   with 5 root or 5 flower craft 5 weakpowder
                                   with 5 root and 5 flower craft 5 healing powder 
have some pity for us betatesters