Here is one wireless, and smaller, and built-in trackball, if it only was illuminated :
Nice Tracker Wireless Keyboard with built-in track ball for cursor directional control, Infra-Red technology.
Designed for Windows
Built-in trackball for mouse emulation
Wireless input with built-in infrared technology,
88/89 keys keyboard with embedded numeric keypad and 12 dedicated function keys, Fully function of 104/105 keys, Convenient and apace saving.
Transmitter Frequency: 38Khz/56Khz,
Effective angle: Within 45 angle degree,
Distance: 7 meters, Power: 3VDC(2) 1.5V AA batteries,
Battery life: 400 hours with typical usage;
Receiver Keyboard interface: IBM AT, PS/2 compatible,
Power: 5V DC, 250mA max. connected to host computer,
LED indicator: Num Lock, Caps, Scroll Lock, Power LED and Active LED,
Sensor: High performance & high EMS immunity; Compatibility IBM AT, PS/2; Key layout 88/89 keys;
Travel distance 3.0?.3mm; Travel to peak 1.0?.3mm; Peak force 50?0 gm; Operating temperature 0 to 40?; Switch life 5 million life cycles;