Was this ever implemented?
We came across a use for this recently: we need to align textures on Parts and Unions, but each one centers textures differently. Parts put the texture’s corner at the surface’s corner. Unions put the texture’s corner at the center of the union.
If we could offset textures on the Union, we could make the Part and Union textures align. It’s not reasonable to pre-make offset textures in our scenario as we’d need at least 4 variants for what might eventually by hundreds of textures.
We will either settle for misaligned textures or find a work around, but this feature would be much more efficient that any workaround we can implement.