User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-82.2.49.36-20130324164919/@comment-5469467-20130325065521

Being able to spend perks after making a skill Legendary wouldn't work at all. It'd be too hard for people with lower level characters and haven't levelled their skills to 100. No, the system they have now is fine.