This would be definitively VERY useful.
For now, when I use the East West Hollywood Orchestra (and Hollywood Strings for example), I must use different staves for different articulations which use CC data for controlling the loudness of the sound (crescendos for example). So I have one staff for violins I Legato, one staff for violins I trills, one staff for violins I tremolo, etc. and the same principle applies to all the other sections (strings, but brass and woodwinds too). This makes the score not very clear and this is not a very practical way to work.
So for me this is a VERY important one, if not THE MOST IMPORTANT feature I would like to see in Notion.