Maybe I'm late in the discussion here and you guys are set - but prefixing the Project with acl* moves it to the top of the list of projects a user is a member of (particularly in Dashboard panels). This strikes me as a usability issue as it's going to be the project a user interacts with the least and is taking up valuable real estate.
I would suggest that projects such as this that are not super active use naming conventions that move them to the bottom of alphabetized list.
Discussed in meeting with Chase and Mukunda and Mukunda said this might be easy enough to list ACL projects at the bottom of project lists via custom code (no idea though if via comparing strings for "acl*" or checking the project icon and/or color here and what's more performant / less error-prone).
Better than renaming to something cryptic like zacl* to have it at the end of the alphabet.