SetACL has a brand-new web 2.0 style feature request page that allows you not only to describe what you think is missing but also to vote on requests made by other users. Ultimately, the requests with the most votes will be those considered for implementation first.
Make SetACL a better product by voting!
This is what the new page looks like:
This new system replaces the feature requests tracker on sourceforge. All open entries from that tracker have been migrated over and marked as such.