Just wanted to say that i've played around with this request and i'm not seeing any 'usable' way to do this. When you try to adjust the Tempo in realtime, the DAW simply can't keep up with all of the data it needs to juggle -- smoothly. Even with my extremely capable system, there is always stuttering, spitting, crying... and that's just ME! Studio One isn't capable of performing this kind of function smoothly either though, therefore it's not a matter of getting it implemented but more one of, can they figure out a way for the DAW (& your computer) to handle all that data processing, smoothly.
Anywho... thought i'd share the fact that i've also tried to accomplish this feat.
Have a good one!