If we decide sometime in the future to add to CR the ability to maintain "cr items light" (i.e. non-revisioned cr items), like Tom, Don and many others have discussed in the past, it may turn out favorable to merge the concept of cr items with acs objects entirely. Basically only differentiate between non-versioned and versioned acs objects, thus.
Just a spontaneous thought from someone who hasn't given it too much consideration ...
/Ola