How about tempo per clip row option?
....saved in the menu for sequencer clip rows under name you could add a tempo in BPM or none (doesn't change tempo). To keep things clean, there could be a little red symbol like a hashtag or something to notate that a row has an embedded BPM or not. That way you press a clip row and the whole thing changes on the downbeat of the next measure. You'd still be free to trigger individual clips from any row without effecting the session bpm. I know this feature would be very useful to a lot of users in many different contexts. Sorry if this has been discussed before, I can't seem to find a search function from my phone browser.