I'm not sure what you are implying. IMO the mouse pad isn't too small, it's the lack of ergonomic wrist support that hurts this, as well as other solutions.
I still maintain that a practical solution is feasible. Lapdog's issue is that if you take the hand of the mouse, it will slide to the edge if not off the pad. A ergonomic bump to serve as a wrist rest could also house magnets to help keep a mouse stationary when not in use.
It's a niche market so I'm not getting my hopes up in terms of Corsair evolving the product but more attention to ergonomics could help them nail the elusive couch solution.