You could set it up to use the Superhub as modem only I think, and put the default gateway of the Cisco router as the LAN IP of the superhub.
I tried this reciently, and it worked... to an extent. It solved my wireless issues, but I discovered that uploading videos to youtube would consistently fail. I've no idea why, but it would upload to a random % then suddenly just stop uploading. I ran a ping test while uploading to confirm the upload had stopped (200+ ping while uploading, which dropped to around 20, when the upload froze)
I've since gone back to using just the superhub, and ive had some issues still, but iv'e tweaked around with it, and gotten it to work somewhat...
disabling IP filtering helps stop the wireless connections from dropping constantly, but the superhub is still a pile of crap.
I found when using Windows 7, that if you disable all the homegroup BS, and use regular old school networking, transfer speeds are better when transfering files.
I can get about 8.8 mB/sec (70.4 mb/sec) over wireless N, when connected at 300 Mbps