my idea (similar to others) was to have it replace your PDA! with it only giving you the option to either build the drone (Option 1) or to give it its commands, with its attack mode (Option 2)it would follow you around and protect you! and then in defend mode (Option 3) wherever you activated the mode the drone will stay there and act like a normal sentry, and in support mode (Option 3) you would tell the drone to retrieve ammo pickups or to repair other engies buildings! now the drones actual stats would be as followed...

Health : 100
DPS : 50
Movement Speed : A little slower than the engie
Metal Cost : 120

now here comes the more detailed ideas, in attack mode firing speed for the drone is increased to 15%, in defend mode health is increased by 15% and in support mode movement speed is increased by 15%, and when it comes to support mode, the drone repairs buildings health (similar to the rescue ranger) but heals around about 15 hp every 3.5 seconds? also in support mode it can't attack but it can heal other players with similar results as repairing. Now as I wrote in the beginning I said it would replace the PDA... this means you can't build any sentries, dispensers or teles! meaning most wrenches to be quite useless, though the could be used to help other engies and equipping the gunslinger would make for a new form of combat engie! now most people would love to control the drone (who wouldn't) so thats what the wrangler is for! giving you total control and even buffing the drone as well, but the catch? you have to be in range, so you you will have to constantly move closer to the drone when you are about out of range, this little thing will not only disable engies from camping spawn but also decreases your chances of staying still and vulnerable.