So! Some ideas to make the following weapons more usable. Or at least, have their own niche roles.

Longswords and scimitars are finessable, so why not? Maces and light hammers are as well, which are used in a very similar manner. Real-life club-like weapons like batons or arnis can be very easily used in a finessable manner. I've seen one, ONE person seriously use a club on Arelith. Ever. Rest in peace, Fur Cough.

Kama's are sickles. Literally. "Kama" is japanese for "Sickle".

Sai's in real life were designed specifically counter swords and other slashing weapons. The free whip-disarm would be fitting, but sadly, sai's are tiny weapons so attempting to use disarm would be suicide. AC vs slashing mechanically makes more sense. As of right now, they're really monk weapons that have a worse base damage than level 1 monk fists.

Either make them dual-wieldable, or make them medium-sized to better take advantage of their innate disarm ability.

Axes are very top-heavy and even without a good edge on it, an axe-head has a considerable amount of weight behind it, making it able to deal heavy blunt damage.
Ideas? Thoughts? Additional suggestions?