I made a short remark earlier about that in another thread. To make it really clear, I think it is good to describe it moore in detail.

When you play a waltz, 3/4, you can bring it easily into a double time feel: you change the Time Signature at the the beginning of the chords from 3/4 to 6/4, and you double the tempo. Thats all, needs 20 sec.

Vice versa you can change 4/4 into a half time feel, by changing 4/4 into 2/4.

A double time feel for 4/4 could be done easily, if a Time Signature 8/4 would be possible.
Unfortunately 8/4 is not yet possible. But therefore even more complex Time Signatures are allowed, like 9/8 etc, I guess, that allowing this in the software should be quite easy, maybe a thing of few minutes?

So this could be an easy beginning for a kind of double time feature for ALMOST ALL EXISTING STYLES, which is a quite good educational help. Maybe later with more advanced options. Just a beginn.

So a "Please, Please" from the heart, please allow this soon.
Thank You!