Alrighty, here are some.
1. AI Charger to jump at interval, cvar controlled timer, would go nicely with Charger steering I think.
2. AI Jockey Jump when capping a survivor for the same reason above, cvar controlled timer.
3. Allow the Tank to throw multiple rocks at once at interval
4. Restore the AI tank and hunter to L4D1 behavior, so the Hunter always pounces incapped survivors if he's near them and the tank will always kill incapped survivors when he's over thewm instead of ignoring them, both cvar controlled for on and off
5. Allow the Smoker to wrap up multiple victims with multiple tongues, cvar controlled on or off
6. Make use of the cut special infected, the 'leaker' and make it work
boomer_leaker_chance
7. Allow the witch to sit or stand at random
8. Restore the L4D2 Beta Charger Behavior as a cvar option
Old Beta Behavior
Left Click = Charge
Right Click = Pummel
There was no melee for the charger in beta.
Around the 4.30 mark, proof of concept
https://www.youtube.com/watch?v=clnmfMQBIbw
If I think of more. I'll post them.