Basically I have a unit with bionic arms armed with a good longsword, in combat it ignores the fact it has a sword and proceeds to fight as if unarmed. However when the unit is Hunting it uses the sword to great effect.
(http://4.bp.blogspot.com/-EKCSLP9yEzw/VKLTngUa8CI/AAAAAAAAC2M/HW9WasdgaZQ/s1600/RimWorldBug1.png)
(http://3.bp.blogspot.com/-bhaoWzdFTBw/VKLTrXO-BCI/AAAAAAAAC2U/kyBKFsXvn1U/s1600/RimWorldBug2.png)
(http://3.bp.blogspot.com/-WrA1W5tbHpU/VKLTw65jywI/AAAAAAAAC2k/-SAG7PyfzPc/s1600/RimWorldBug5.png)
(http://3.bp.blogspot.com/-P2LFSABROmA/VKLTxr6Z4QI/AAAAAAAAC2o/vhljfVCUtFg/s1600/RimWorldBug6.png)
So basically rather than providing my swordsman with an upgrade I've made him quite redundant, I'd presume that part of the problem is inherited from the claw wanting to be the default melee weapon, but I'd prefer he use whatever is in his hands.
(http://4.bp.blogspot.com/-vuMCeekUbNE/VKLTmPkaQNI/AAAAAAAAC2E/vcAEHC6PzMo/s1600/RimWorldBug3.png) :'(