I personally am not a fan of free aim but I do like the angle thingamajigs you've done here, looks pretty cool. I've animated most of the weapons and such and I have no problem with the animations being used elsewhere *Maxx made a majority of the firearm models and I would guess according to his above post he would be in favor as well*
My main concern is people need to know the models/animations come from NMRiH and were created by said devs. NMRiH doesn't have enough popularity as Garry's Mod does so people will believe that you've created all the content used in your addon *Check the comments in your videos even, you'll see what I mean* I know you'll give us credit but you need to find a way to really stress the fact that we, the devs, created such content, I'm perfectly fine with anything as long as credit is given where it's due.