I wouldn't expect that ALL the things extensions are doing will ever be implemented natively. That would defeat the point of having all the extension facilities in the first place.
But here, from the actual head honcho:
https://askjf.com/index.php?q=3438s
Now would they deem it worthy to implement these MIDI modifiers is entirely up to them. Justin is not a heavy MIDI user, so schwa is our hope, however faint.
As far as I am following the situation with Julian's scripts and his extension API, in due time he'll be able to do the bounding box transform thing that Cubase and S1 have. Sexan has the same thing working for area selection, in fact.