
Currently we have
Stone Saw, Steel Saw & Hand Saw(Shop).
I'd like to Suggest a Metal Saw made from wrought.
This one can be "put" on a Tree or Sawbuck and can be taken off and put back on as needed.
However to actually cut with it, It'd require 2 characters.
On a sawbuck this would be slightly faster than a stone saw. It would also increase the amount of boards you gain slightly, depending on the 2 characters Hammer & Nail. (higher H&N would yield more boards however tuned so itd be 1.15 or so better than current 1 person sawing.)
When placed on a tree it'd require 2 persons yet again however the time to "chop/cut" a tree down would be significantly faster than with say a steel axe.