Daniel,
that signpost is completely logical and jibes nicely with popover entry, and I also understand how to use it.
I think much ambiguity could be avoided if the “beat” would always mean whatever the denominator indicates, and this should naturally extend to panel entry of time signatures.
Please consider this a feature request… 
Thx, and all the best,
Benji
P.S.: I just read up about compound meter, and understand where you’re coming from, but my feature request still stands for the sake of clarity and consistency. 