Multiple sets of tags (for a single board)

Hi
I would like to be able to create (at least) a second set of tags on a board.
We use tags a lot, and sometimes make additions to the title of stickers to distinguish between different “areas” of some sort, or define different frames to encapsulate different things. 
The current tag feature works great (although more color options would also be nice 😉) enabling an easy way to show an overview (in our case e.g. showing status).
A second tag set could enable an even better overview, e.g. by showing both to which improvement initiative (or similar) that a sticker belongs, while still showing status.