Confirmed - I tried it last night.I have made these changes:
1) Autoloot excludes bladearrows to prevent from getting more arrows than you could carry.
2) Now also Pchar and officers switch to tomahawks (if they got one!) when trying to hit with an bladearrow.
3) Pchar, officers and NPC:s do this also when hitting at an blocking enemy. Earlier only when hitting the body.
Tested and works.

Would it be possible, instead of switching to tomahawk, to use whatever procedure is used for quick-equipping (e.g. if you press the "F" or "1" key) and choose a melee weapon for PChar that way? If I'm carrying a nice sword and a bow, I want to use that sword when I close on the next Indian, not the tomahawk I looted from the previous one. Otherwise I just have to press "1" myself to equip the sword.
I tried the obvious possible exploit, which is to give a bow and some arrows to one of my officers, take away his gun so he has to use the bow for ranged combat, then see if he spawns a tomahawk. He doesn't. Which is fair enough, but it was worth checking.

Thanks for the work on this. Now I just need to acquire some curare and tar in order to try out the specialised arrows...