This is a great request, but I'd build ontop of this module. If you create the ability to sort by rep, you should also be able to pull other data types and provide additional ways to sort.

I'd like to see comments by people who follow you. Or perhaps, sort by activity (which threads has the most responses).

Ultimately if the module allows you to pull that data, you could theoretically sort by any metric. That could be upgraded at a future date. Great proposal.