Hello, I would like to point out some silent errors (if these are considered silent or errors).

1. For certain player models like the enhanced citizens, Casual Gordon Freeman, etc, when these are applied with this addon enabled, the frame rate drops a lot, 140 to 20 and stays until a different model is selected. Some are not as agressive, 140 to 90, 140 to 130 etc, some don't even effect the frame rate at all. Not sure why certain models cause this.

2. The camera used for firstperson in this addon, breaks the camera in others. The WOS roll (think that's what it's called) addon has camera features that this addon breaks with no error. the camera for that addon is also in firstperson.

3. The playermodels body follows the firstperson camera's movement. What I mean by this, is that when ever the camera moves towards the ground (this is where the issue is) the playermodel seems like it's sinking through the ground. The Sharpeye addon modifies the camera to move like this. In Gmod legs 3, The legs do not follow the camera.

I hope you found this helpful and that these will help you fix and optimize the addon a whole lot :D
(I don't know how to integrate links in text, sorry) The reason why it's a disscusion and not a comment, this is more than 1000 characters.