2,777 votesAnonymous commented
Clicking on an ornament such as a grace note and changing its value does not affect the sound of its duration.
You can get this effect by using the overall time signature you need (such as 7/8) and then using beams to show the rhythmic groupings you want.
BUT it seems like you are talking specifically about how the time signature is displayed. For example, the one you mentioned would look like this:
This is not necessarily standard notation, but it is used sometimes. We would consider it but because you can already get the music to sound and read in the way you want, in the most standard way, it may not be a priority for us.
Please add more detail in the comments so we can understand what is more important to you: the way it’s displayed (we don’t already do this), or the ability to write the rhythms you want (we do already do this).