A hard-plastic, rugged casing like on a Motorola handheld
A black casing, not the attention-grabbing grey/silver
Dual receivers would be nice for fire tone-out
Bluetooth for using a cordless headset or speakerphone
Automatic digital recording of the last several minutes
4 AA batteries (2x2) instead of 3 for longer battery use
Enough TGs per system to cover largest statewide systems
Stock BNC connector instead of the SMA connector
Show CloseCall results immediately instead of Press Any Key
New Idea: A special jack on the scanner that delivers power, data, audio, & antenna connection. It could plug simply into the scanner and by way of maybe a 6-foot cord, plug into a small adaptor box which would house connections for all four. This would allow you to simply have one cable going to the scanner in a permanent install in a vehicle or at a desk, etc. It could plug into the side of the radio (like Motorola speaker-mics) or the top/back.