Allow custom tag to belong to more than one "custom tag shortcut"

What is the feature or ability you would like to have?
Would be great if a specific custom tag could belong to more than one custom tag shortcut.

For e.g, if I have a combination of tags, and some of them overlap, like the more common ones (Genre).

Now, when you try to add another one, it gets overwritten:

How will this feature help you and others?
Make it easier to tag tracks.

Does a workaround currently exist?
Yes, by using another separate shortcut to set the tags that overlap.