Such as the ability to control Hand Types, Special Attacks and if they can be dual wielded with swords.
To go slightly more in-depth; its largely like I want to have a Katana be able to use a Shield or be dual-wielded. Or if I want a Sword to use the Greatsword Special, etc. But just more config options would be nice as someone who routinely likes to build modpacks it'd be great to have more config options.
This is just a neat feature I'd like to see added.

Edit: Also the ability to give a Weapon Throwing Animations