A drone, while kind of squishy, is not totally unable to pat it's head and rub it's tummy (so to speak). An autosoft is NOT needed to actually make a test. It just increases the dice pool. A maneuvering autosoft will give you extra dice to dodge. Much in the same way as shooting for real people as well, you don't NEED an autosoft on the drone for it to fire (4th Ed, I know this was a thing, but I'm not seeing anything in the 5th ed rules that say you can't shoot, dodge, sensor, ect. defaulting). It'll just only be rolling it's pilot (3) minus 1 for defaulting. Two dice. Won't be able to target worth a damn. However, that's why I load up targeting autosofts primarily instead of loading up manuvering ones. You'll just have a problem with dodging shots.
As a rigger, you have to choose what to do for drones. Not only can they load up their own autosofts, they can use yours on your RCC as well. The rules do state that a drone can only use the RCC programs if it doesn't have it's own loaded up, but I think it would be easy enough to handwave letting a rigger disable drone programs to override with RCC programs (talk to your DM, your mileage may vary). So, what I would do is this:
Have three groups of drones: air surveillance, ground surveillance, and support.
Air surveillance drones should have a good Clearsight and a good Stealth autosoft (can't remember what the actual autosoft names are). Then, have a Targeting autosoft for them on your RCC, in storage, ready to load up and run when you need it. Do the same with the ground surveillance ones, but I would ready a Maneuver autosoft for them rather then a Targeting one. Finally, for the combat drones, load up a Targeting and Clearsight autosoft and ready a Maneuvering autosoft in case they are going up against things they can't kill outright themselves.
When we get the Cannon Companion or Arsenal book (which I believe is the first splat book slated for release) we'll have a lot better ways to trick out and customize your drones. But for now, use them safely and try to overwhelm opponents. If you can't do this, use your combat ones to Covering Fire and zone control while your actual street sams flank or run away.
First and foremost as a rigger, you are support. Your job is not to blow away targets. It's to light those targets up and inform your group so they can do it that much better. And have autosofts ready to load up into the RCC to get them out of danger.