I am seeing a problem with a lot of the new Stack Exchange sites. There are not enough users with edit rights to make the clear and simple edits that are needed. So we are getting lots of comment asking for edits.
Therefore I think, while a site is in beta, any user that has over XYZ rep on another site should be given edit rights. By the time the site comes out of beta enough users should have gained edit rights on the site itself – otherwise the beta is ending too soon.