yes I would completely omit those. because I'm not sure how rewarding it would be after 5 more years of Perl 6 coding to see that the time spent proves to be worthless.
The idea is, let the people who have money to invest and spend in stuff like Haskell and Java compilers experiment all they want, learn from their mistakes (which you cannot possibly reproduce in a useful timeframe with a handful of people who are developing today on Perl6) and use what you've learned so far in your compiler.
Since it is year 2010 I doubt that each and every feature of what you mentioned is novel. Actually, I'm sure it has been implemented in some compiler somewhere. The Perl6 team needs to find all of those and see how succesful they have been without the effort of implementing them. This is all a question of time, if you waste the precious time on useless things the failure will be of epic proportions.