I'd like to unify the Guns and Energy Weapons skills - they don't really do seperate things so there's no game-balance reason to keep them seperate, and being able to use both would give me a greater variety of killage. The most compatible way of doing this would be some kind of script that increases Energy Weapons whenever you add levelup points to Guns (and vica versa), but I have no idea how to do that. A kludgier way would be to edit every Energy Weapon and related perk to use Guns instead, but I don't know how well that would work.. Does anyone know how to do the script, or can think of a better way to do this?

(I'd also like to unify Melee and Unarmed, it's all just hitting things).

You could change all energy weapons to require guns then add them to the guns group. Combining melee and unarmed would be trickier, as unarmed weapons, like all the gloves/fists have special moves and animations associated by virtue of being unarmed weapons. If you make them melee, they lose those special attacks. If you make melee weapons into unarmed, then they'd have those animations, and it just wouldn't make sense.

If guns>energyweap
then
set energyweapons getav guns
else if energyweapons>guns
set guns getav energyweapons

or something like that

This already exists.
http://www.newvegasnexus.com/downloads/file.php?id=39973

Haven't tried it myself, but anything from LFox should be quality.

Awesome, thanks

I would think it'd make more sense to split guns into Handguns (Bullet and Energy)
and Rifles (Bullet and Energy).