The differences and changes between this and the original mod are:
Modified headbob animations
Increased tilt animations
Increased sway animations
Re-enabled camera shake and slightly lowered it
Fixed static shooting animations for all weapons affected by the original mod
Added a crashifx for the secondary saw, parachutes and underbarrels
Fixed an issue where melee weapons could replace firearm models
For custom/add-on weapons you'll have to use the Perfect Viewmodel mod and adjust the viewmodel positions of the weapon yourself. Nothing I can do about it, sorry.
Preview of the whole mod with my changes included since the original author hasn't made one