Well, the best place to ask this would actually be on
perl6-i...@perl.org. This list is not really concerned with
parrot, at least at the moment (but that looks like it will change
pretty soon).
And, I don't know much about it, but I do believe that this is part of
the plan. When Dan Sugalski was our grand architect, he mentioned it
a fair amount. I think that we use a different runcore for code that
needs to be safe; i.e. no JIT allowed.
Luke