Hi Bull,
Some of the examples in the core rulebook suggest that drones should be able to be augmented. It seems that the Pilot Program could be increased since there is the section on how you can't copy a pilot program from one drone to another (p. 269). The example on p. 184 has the rigger having upgraded his drone's Sensor rating from 3 to 5. I know in SR4 (Arsenal) drones could be augmented to make them more survivable.
What do you think about putting some campaign rules in place to increase some of the drone attributes/armor until such time as the rigger supplemental book arrives?
~Jason