Some flexibility around being able to name individual Anaplan time members, like a Display Name, would be helpful. One of the reasons we have to use fake time lists are that users are uncomfortable with, for instance, the W/E or W/C prefix
Another big reason I've used fake time is when the model simply does not need a large number of time members but Anaplan Time as well as Time Ranges only provide the option of adding or removing a whole year. A subset concept for Anaplan Time or else a way to add months or quarters instead of whole years to the calendar would be great!
My last idea might be a little crazy, but I've always wondered if it's possible to mark any list in Anaplan as a Block type list (I'm not sure if that's what it's called) but basically enable a list and mark the blocks that make up the list and then the list would function the way Time and Versions does in Anaplan. In essence, allowing functions like PREVIOUS or OFFSET on any list. I imagine this would do a real number on performance though!