I'm aware that we have the avatar scaling parameter exposed and can use them to drive other things, but the ability to do the opposite would be incredibly useful.

Example case: I have an avatar that has a werewolf transformation. Ideally, part of the effect would be having the avatar slowly grow from 1.47 meters to 2.2 meters tall. Currently, this is impossible as setting parameter drivers to the scaling parameters do nothing ingame (even though they work fine in editor)

Avatar scaling is already something we have direct control over in our menus. There is no reason we should not be able to write directly to the parameters themselves.