Now I've not worked with the new TVPaint Pro 9...
But from the listed improvements...this is still missing
A better way to control motion over x,y,z (and time with velocity)... paths etc...along with a graph editor.
The old profiles way is very limited and can not create many motion types or give us the full control needed for many tasks.
I hope that this is something being looked at for a future version
Also a way to input & output this data.
Cheers,