the ability to hear each note in the event editing list, as you scroll it. More classical styles. World music styles. Punch in/ punch out points in Realband by clicking directly on the midi or waveform, rather than entering numbers, that's too dull.

Good intros and endings in Biab, similar to the ones in the Yamaha workstations. Especially the intros, are too dull and predictable, always starts with I, ends with V , etc

The ability to program, simply and without fuss:

crescendos,
diminuendos,
rallentandos,
accellerandos

I am sure I have more, I even made a list that I have somewhere, but for now these are the ones I thought of