Please put this somewhere in the docs.
I just spent a couple of hours writing this into the repo for a pull request before I found it.
You can sort by multiple field in a fetch results controller using the syntax...
Brilliant, but NEEDS documenting.
If you are not using a fetched results controller, there needs to be a way to sort by more that one field. -MR_findAllSortedBySortDescriptors:(NSArray *)sortDescriptors;
I agree — I'll see what we can do for 3.0 on both the documentation and API front for supporting a traditional array of NSSortDescriptor instances.