Adding onto this topic I have a couple of suggestions for some craftables that may be neat to have on the server:
1 Slab + 1 Slab = 1 Double Slab (for all slab types)
1 Door = 2 Door halfs (Vice Versa) (Half doors can be used as Cabinet doors and other decor)
1 Iron Door = 2 Iron Door halfs (Vice Versa)
Minecart = 5 Iron Ingots (this way people could use minecarts as payment, and people could disassemble them for a more tradable resource)