For me it would provide even a more versatile use of Real Tracks by being able to control and change when and Which Timebase is used - so I can go Half Time in verses and Normal or Double Time in Choruses.

Would be great if this could be controlled through F5 Bar Settings.

I agree. From my experience with timebase settings other than Normal, this one may be hard to implement. I hope they can.

I haven’t tried a workaround with generating multiple tracks of different time bases, then editing Utility tracks. Assuming you are even allowed to do that, the muting/unmuting is probably easier done in a DAW.

+1