SO we looked at this and it adds so much weight and battery drain. There are a million micro-robots - believe it or not this form factor and simplicity is what makes us a go-to tool (contrary to what you might think, under a lot of stress first responders may not want to drive something around given the additional cognitive load)
You already need someone watching the screens. I don't see the driving being a big increase from that. Weight and battery life don't seem to be a concern. There are drive mechanisms that use mass distribution or inertia to drive it like a wheel and don't use much energy. This is especially true if you're throwing it and just need to retrieve it because you made a bad toss, or need to clear an additonal angle.
