How to create a criteria allowing field modification of items only on ECO but any rev

Is there a way to setup a criteria to only allow an item's field data to be modifiable when the item is on an unreleased change order or has never been on a change order at all but not to make the user select a specific rev? 

The $LATESTREV Is Introductory only seems to apply to never released items.  For changes 2 up it does nothing.  So I've had to use $CURRENTREV = $STATUSTYPE.* but this requires the user to select the pending rev to do the modification.  Which is confusing at best because the field data is not rev specific in our system.  Is this a bug with $LATESTREV?  Should there be a $LATESTREV Is Unreleased?