Multiple sort criteria?

I am curious, how difficult would it be to implement a means by which a
person can sort by multiple critera, in much the same way that one can
search by multiple criteria? The stackable search method is well-loved
here, but some people would like to be able to say, sort search results
by Priority, then by user, or something along those lines. If such
functionality were feasible to add to RT, would it be something we
should do ourselves, or is it already planned for a future upgrade?
Thanks for helping with my musing on this oneā€¦

Joe Gosselin
Jr. System Administrator