1. I suggest making them hookable, it makes the game more difficult, and more challenging, trying to hook other butchers while avoiding everything/everybody/everyone you see.
2. I don't get this one.
3. Don't add denies here, sometimes hooking your friend to save him is cool and awesome to do. Making it as a deny or something of the sort will ruin the awesome part of the game.
4. If it procs too much, then you must fix it indeed.
5. That's how it works. Neutral creeps are for those who can't lane farm, neutral creeps were meant to be a slower farming spot, and lane farming is a better farming place, because you can snag kills, and the creeps there are weak. That's the point of neut farming, getting hard kills, and gaining gold slower. That's why lane farming is adviced, because it yields more results. So I suggest not making neutrals give more gold, exp, than lane creeps, because that would make the game a neutral farming game, not a fast-paced AoS game.
6. No comment.
7. That's already suggested. Owait, wtf? Add custom skillz for the spells? That's sounds weird, lol.
8. No, no, no. That's the point of those, to protect them for easy tower kills. That's why there are creeps spawning along with them, to protect them getting killed. Making their range so far so that the towers won't hit them, is a really really bad idea imho.