first of all I must say that notation composer is a perfect program. Im very Happy haven it!!!!
I would like you to add several tuning systems like pure, meantone intonations and well temperaments (Kirnberger, Vallotti, Werckmeister, Young). as well as different options of equal temperaments like 6-tone, 9-tone, 12-tone, 15-tone 17-tone, 19-tone, 22-tone, 24-tone, 31-tone, etc.
It would be good to have better bending and vibrato options for guitar and keyboard.
Best wishes for everybody.
Angelo J. Martino