This is a tangential feature request regarding sorting, but it would also be convenient to have the ability to sort for Links to table as well (and indeed, multi-selects). In that case, this would need to be an option for the field, not via a function.
Noted! Thank you for your feedback @Yam. I think it would be best if we add the SORT function first (as it might require less development work), and have the separate issue of adding sorting for the Lookup/Rollup fields. What do you think?