I would suggest this looks like something for BlitzMax (sorry)
Excellent. We can get the omnipresent "wait for BlitzMax" suggestion out of the way early this time.
To answer the actual question, I think a lot of people would probably want the flexibility eventually, but it might be good idea to start with the Blitz level stuff and add the lower level stuff later. If it's not possible to do it that way, and the choice will affect how you wrap everything ( I'm not familar with Nebula from a code perspective, so I really don't know ) then I think it would be better to have the flexibility. After all, lack of flexibility is one of the things people most often find to complain about Blitz3d.