I've cleared another major hurdle today (well, last night/early this morning), and now have a custom control scheme working in game. I've achieved this by defining a control scheme that is only activated in the Unreal Demolition gametypes. With this, I now have vehicle stunts complete, completing the vehicle framework for the game. Although things still have to be tweaked some (especially in the vehicle physics department), I can promise that things are turning out pretty well.
With this, I'm now moving onto making at least one full level for each gametype, and starting work on the Soccer and War Mode gametypes. I'll also be starting internal online testing this week, so I'm hoping to start having video up soon showing at least some of the early work being done.