SP-16 - Feature Request - Tag samples

When I play live with the SP-16, I don't wanna be limited to a set of 16 samples, so I instead switch out the sample on each track. But it's not easy to keep track of which samples I have already played during the set, so it would be great if there was a feature where you could tag the sample just like you can with the CDJs using the "tag track" button. Just marking them red or something so I know that I've already played them. Cheers!