Right now on Roblox, plugins can’t change the colour/normal/roughness/metallic maps of SurfaceAppearance instances.
This is because they are LocalUserSecurity properties, which means they may only be changed by the command bar, not by scripts. I presume the rationale behind this is that these things are too expensive/infeasible to change at runtime, but this is unnecessarily restrictive for plugins which operate entirely within Studio.
Right now, the only way for a plugin to work around this is a disgusting and pretty embarrassing hack:
I don’t see any reason this should be restricted the way it is, so it would be quite appreciated if we could have this so we don’t normalise our users running arbitrary code in their command bar.