If you go the emerged route, it's possible to build a pretty decent drone rigger technomancer. See if the GM will let you take a Control Rig as a Complex Form (2 BP for an unrated Complex Form = 10k in Resources BPGen, which is exactly the same cost as a control rig!) Take a Smartlink Complex Form as well. Then just judiciously assign your remaining BP (or Karma) amongst Complex Forms, necessary skills, and your Resources.
You can take a few ranks of Compiling and Registering and pick up the Dronomancer stream which will give you access to a couple of sprites that can hack and hijack things for you, if you decide you don't want to put any resources into Hacking skills, Exploit, and similar Complex Forms.
Good Matrix Attributes are nice, but honestly the one you want to focus the most on will probably be System, since that limits how many active subscriptions you can have at one time (and drone riggers need that!)
Complex Forms (or Programs if you want to stay a mundane) you will want are Encrypt, Analyze, Stealth (SR4A stated that Track can now be used on a drone to find the physical location of the active subscriber, meaning non-hacker riggers now have a reason to have this one), probably Data Bomb, Command (as high as you can get it!)
Jumping into a drone means half the pool comes from your drone's own attributes. That means you need to beef up those Sensor packages and upgrade those Response chips. You can upgrade all your drones and vehicles to Response 4 pretty effortlessly and cheaply in chargen, and still come in under the new limitations SR4A added to Hardware upgrades.
If you play an emerged rigger, it's probably easier to do without hacking skills since your sprites can back you up. If you play a mundane rigger, however, it's probably worth the investment to drop some extra BP on more programs and skills to at least have a token hacking ability. You'll have the points for skills since you won't have to worry about buying up a Resonance attribute anyway.
FYI: I'm playing this build, an emerged dronomancer (albeit made in a pre-SR4A 750 karmagen) and he's alright. My killcount after 2 sessions is up to 16. Good times.