Some extensions add their own layers (e.g. Simple3D (adds new drawable and new layer group), CST's 3D (adds new drawable to existing pen layer group)). The suggestion is to provide some way for other extensions to add more dropdown options to the first block and output values to the second block:
Custom layers are now supported, as discussed in Discord.
For anyone reading this in the future, to have a custom layer supported, add:
customDrawableName and the Extensions Layer Name to the Drawable :)
Some extensions add their own layers (e.g. Simple3D (adds new drawable and new layer group), CST's 3D (adds new drawable to existing pen layer group)). The suggestion is to provide some way for other extensions to add more dropdown options to the first block and output values to the second block: