Is there anyway to contact whoever handles commercial apps for the Software Center?

As far as I know the contact form is your best bet. It normally takes some time to get a reply though as Canonical does not yet seem to have the capacity to answer such detailed questions quickly, but you should be able to get a response through the contact form eventually.

Based on his answer to this question re commercial apps, you may want to contact Michael Nelson at Canonical via IRC on freenode (nick: noodles775).

Also, in general try joining channel #ubuntu-app-devel on freenode IRC and just asking, a lot of the Canonical people hang out there and someone may be able to help or at least point you in the right direction.