There actually are variations of daggers that look like rapiers. Example:
![[Linked Image]](https://i.imgur.com/KGcYM6p.png)
Most weapon skills will follow the attribute of your primary weapon. So if you use this rapier for instance, Crippling Blow, Battlestomp, etc. scale with Finesse.
For all I know, these different finesse weapons may drop more often later on in the game.