> (but it won't make the ammo pickup sound and flash, and it's probably not possible to set the decoration "ammunition" to fall from enemies
Possible.
Plus you should learn more about "map return" usage in manual.
> "Keep in mind, this is a swap for sprites, not a replacement. You will still need to provide editor with at least Pickup sprite for entities and weapons. Since models are just swaps for sprites, you will need to provide proper number of frames (which in most simple case is the same as sprites number for your entity or weapon)."
FOR REAL?
You can use a huge number of frames. To make things easier, you can store many frames in one line. Example:
frameset 0 43 1 0 0 0 NONE
So frames from 0 to 43 will be played with speed 1. Need to note that frameset can't execute any actions so if you need to execute them, make it like this:
frameset 0 43 1 0 0 0 NONE
frame 44 1 0 0 0 ATTACK (or anything)
frameset 45 64 1 0 0 0 NONE