I have just run into the problem of not being able to edit an answer (to add a link) on http://bicycles.stackexchange.com/
Some of the comments on answers/questions seem to be due to people not being able to edit.
As it is a new site with not many users/questions it can take a very long time for someone to get edit rights.
Therefore I think the rep needed for edit rights on new sites should be a lot lower (maybe around the 250 mark).
(It may work having the rep requirements being lower on new sites for users that have proved themselves on established sites then for users that don’t have a stackexhange record.)