Well adding firesteel to bacside aint bad idea,and some have done it by themselfs,and i mean now rod type,not any flint strikers.
Id want it to be in the bigger size too,in size of lets say oh trekker.
good saw
one good whittling blade
compass sunked in handles
phillips screwdriver on backside too
one simple,rather big,4-7mm flat screwdriver if any of that type OR better yet,chisel instead of flat driver(as in their multiools).
Good awl / spike with hole for thread,for coarse sewing and punching holes into leather etc.
and locking tools,atleast the main blade should indeed lock.