to knap stones, or use some of the recipes where the intention is/was that the tool modifies the medium (e.g. sharpening sticks), the player will have to hold the tool in the offhand (press F) and the medium in the mainhand.
[ ] hold stones in off and mainhand to knap mainhand stone into a tool
[ ] hold knife in offhand and stick in mainhand to sharpen the stick
[ ] hold sticks in both hands to make fire (firestarter replacement)
[ ] hold flint in mainhand and steel in offhand to make fire (replace flint with knife?)
[ ] hold a drum in offhand and a stick in mainhand to play music
to knap stones, or use some of the recipes where the intention is/was that the tool modifies the medium (e.g. sharpening sticks), the player will have to hold the tool in the offhand (press F) and the medium in the mainhand.