Other uses of Custom Models
Persistence
If you want the Custom Model to be temporary, you can set persistence to false with the appropriate node so that the model is automatically deleted when it is downloaded.
Model Data
If you are familiar with Block Data, these are the variant for Custom Models. Model Data allows you to send data (text) via script to a Custom Model, which can read it via a listener.
Spawnanimation command
The command /custommodel spawnanimation <id|name> <animation> [duration] spawns a temporary custom model for the duration of the animation or the specified duration.
Mob Model
The Set Mob Model node attaches a Custom Model to a certain entity. Basic animations (walking and idle) will be supported in the future because they still use the old Model Editor (a poses).