NaturalPoint makes both the TrackIR and SmartNav systems which use the same type of tracking technology although the cameras are a bit different. TIR only controls views and doesn't do mouse emulation while SmartNav is specifically designed for mouse emulation but not views. Unfortunately, neither appear to do both.
It might be possible to use both together though. TIR uses a three point reflector (or three point IR light source) mounted on a ballcap or headset. SmartNav uses a single reflector and the description indicates that, like TIR, you would typically put this somewhere on your head (a hat, your glasses, mic boom, etc.) but you could also put it on your hand. You could get both systems and place TIR in the normal position on top of the monitor with a good view of your hat reflectors and put the SmartNav camera on the desk where it can only see your hands. With the SmartNav reflector on your hand you should be able to control the mouse.
Before spending the money though I'd contact NaturalPoint and explain your situation and what you need your system to do. There are people that have written additional software for TIR that gives additional functionality but I didn't find anything that combines both view control and mouse emulation. I'd certainly ask them about it before buying both systems.
