Custom identifiers for channels ?

Sampler used to take in custom identifiers for channels when I imported my own .sbsar, but not anymore. Example: I am using the SPECULAR channel as I do not need it for my project, and named the label & identifier ''Packed_MSK''. We need to pack things a certain way for our project.

It used to take the identifier that was set within the sbsar. I am not sure when this happened with the last updates, but now it will refuse to take anything else than the usage, this example being specular. This is causing an issue for other artists as they would have to rename everything everytime they make an export.