Reply to USB Headphones + Traktor

Sent an e-mail but figured I would elicit a faster response here.

First off let me commend you on the amazing work you are doing and thank you for your time taken to read this. I'll get right to the point. I just purchased a (regular) VCI-100 and the black SE overlays (oops). I currently use Agorriddim's djay software, but it just isn't as versatile as I want it to be (could it be?). I want to upgrade to Traktor Pro, but dont have the money for a soundcard yet. A couple questions:

1.
What I need to know is: In Traktor Pro, can I use my USB headphones and macbook sound output together as an aggregate device to pre-cue in lieu of using a soundcard, that is, for the time being?

2. I just purchased the black overlays from you for looks alone, and didnt even consider that the layout was for the SE edition and firmware. I know you can update firmware on the VCI, but did I make a mistake in buying the overlay? How different are the controls vs the standard? Would you recommend a firmware upgrade so that the controls will match their function?