I guess you figured out with that. 

Hey PJ!

So, 'yes'.  That's the screen and alternative animations will do what you're looking to do.

You'll first click the + button under Animation Alts and indicate which ORIGINAL animation you want to work with.

Then you can add Alt_Animations in the right window pane.  These are the animations that will be played instead of the base animation when the character is wielding the indicated weapons.

I believe the weapon requirements are inclusive (i.e. if either requirement is met, the alt anim will be played).

I believe the priority is counted in descending order (i.e. 0 takes precedence over 1).

wish I'd known that before i did all that internal .skeleton renaming but what the hey...

I think internal .skeleton renaming it's easier than the "alternative animations". When I was working on my dwarf, I had a lot of strange things with this.