Thanks for the positive comments guys
Nah I stunt with the character from the video and it really doesn't have an effect on the physics, I remember in like 07-8 or something the other dude who rigged characters said he messed with the weights (a LOT) in the character rig and he thought it felt slightly different in game.
He apparently set every vertex to the max weight all on one bone or something and it had a slight difference, but
I wasn't able to reproduce anything similar so even if it does have an effect, it would be less of a difference than playing VC on 2 different computers (one might have a fragged HDD and cause some lag occasionally or something)
I will say that the widescreen fix made stunting seem a lot easier lol, being able to see properly and not have everything distorted really helps apparently

Here's the widescreen fix (also fixes the mouse not working bug, though so does the "silent patch" which fixes some other bugs, I haven't tried to see if they work together so I'm sticking with the widescreen fix)
https://thirteenag.github.io/wfp#gtaand if you want to play VC in first person like the intro, it works pretty damn perfectly (if you have dannyes, get into a car and change to first person view, if you do it on foot the jetpack comes on and it glitches)
http://gtaforums.com/topic/882217-the-first-person-view-for-vc/