A personal sore point for me when using QUnit is the lack of nested suites (modules) that are offered by other popular frameworks like Mocha and Jasmine.

I've given it some cursory thought and, if we agree it adds value, I don't foresee any major roadblocks to implementing that capability. It would give us some options for richer reporting outputs as well, e.g. Mocha's sleek nested HTML report: