I suppose this is perhaps more of an issue than a feature request but alas…

So for example, If I have a quarter note triplet and I wish to change one of the tuple (triplet) partials from a quarter note to a dotted eighth “tuple” plus a sixteenth note tuple, it does not allow it when I use ctrl + alt + D and gedit via the ‘Duration’ dialog/popup. The work around is I just re-enter using the note entry panel and select eighth note, dot and 3:2.

(Windows; Encore 5.0.4.875)