I have a problem right now that others are unable to edit the wiki, even though I have selected their group under the page's edit permissions. I have SimpleWiki set to use TinyMCE, and when someone other than myself tries to edit the page, they can't get past the login screen. They get no error message, they're just sent back to the login screen over and over.
The group of users that I have enabled edit permissions for the wiki do not have privileges to anything else. I'm guessing that this may be causing part of the problem, but I don't want them to have access to any part of the CMS backend.
This would be due to the fact that the wiki page requires "canEdit()" access to the page - currently, there's no specific permission for editing a wiki page, which I'll add to the list of things for the next release (which I'll hopefully get a start on over the next week or so).
A nice benefit of this is a specific issue tracker for the project, which I'll use to track what's to be done - feel free to add directly to that list, or I'll copy + paste from this thread. Either way, a status on progress can be found on that page.