Object ID's can be found using MooMapper (Select a model and get its ID) There are too many to list.
AnimationID's are being compiled (24 = sit down, 32 = dance) It's more about experimenting to find them.
Sounds are playing up atm! (Unless thats me) but I'll look it up.
InteriorID's can be found using MooMapper again, click on the interior, get it's ID.
Ammunations should become active when you toggle them on. I thought I posted a sample on the wiki (I'll check and post if not)
Weapon pickups can be respawned (Using the writing pickup id, I use 15, seems to reappear after sometime.)
The limit for vehicle TYPE is 47 (I've used 47 in the script I've been working on and it's fine.)