Kameo Co-Op on XBL

Ok, grievance with Kameo on the 360 – why can't co-op games be done on Xbox Live? I suspect it was going to be, but was dropped to make the game ship:

• The manual, when talking about setting up a cooperative game, talks about logging into Xbox Live profiles.
• The game, has a menu to choose the cooperative game mode. The only option presented is split-screen.

Seems odd that the manual talks about Xbox Live profiles, and there's a menu for cooperative mode in the game with only one option.

I want XBL-based cooperative modes for Kameo. That, and a fixed multiplayer mode for Call of Duty 2.