Allow time signatures with partial measures when timebase=time

[juliansader]

If the Timebase for tempo/time signature envelope is set to Time in Project Settings, the time signature dialog box greys out the option to "Allow a partial measure before this marker", and adds the message "(option disabled because project tempo envelope timebase is set to time)".

To insert such timesig markers, the user has to switch the timebase to Beats, insert the marker, and switch the timebase back to Time.

I do not see a reason why timesigs with partial measures should be restricted to Timebase = Beats. To the contrary, when I do tempo mapping, I am much more likely to be working in Timebase = Time.

[joshxtra]

I have just been researching this, sorry to revive this, but what would actually be the difference of the timebases regarding the time signature markers?
Leaving the tempo envelope timebase set to "beats" and the item timebase set to "time" seems to work well...