How exactly do you do drone targeting without sensors?
Didn't say you didn't, but there's a difference between using sensors to target and using sensor targeting (p. 184).
At what point during the character creation process do you adjust your Essence (thereby losing Magic/Resonance and max Magic/Resonance as well)? Is it, say, possible to start with 2 Magic, lose 4 due to Essence Loss bought in Step Six, then use 5 Karma during Step Seven to raise your Magic back to 1 (as Magic users can still raise their Magic through Karma as long as their maximum Magic isn't 0), thereby essentially getting 2 of the Magic points lost to Essence loss for "free"? If not, would it be possible if you wait until character advancement to buy up your Magic?
That's a very good question. I think you can do it the way you describe. Even if you couldn't, you can still raise it during character advancement as long as you still have a maximum Magic rating better than zero.
And yes, this does seem to be a difference between Magic and Resonance. The two are, after all, different to the point of being mutually exclusive.
I have to object to this. First, remote control is different from rigger control. Remote control is described as a video game, while rigger control is direct neural interface. Jumped-in riggers use Intuition for Sneaking rolls, not Agility.
That is correct. Also, forgive me for pointing out that a specific rule doesn't always indicate a general one.
Second, Riggers are already relying on Reaction, Willpower, Intuition, and Logic for doing everything else, plus they actually have to possess the necessary skills. Why add Agility to the list? At this point, what benefit exactly does a rigger get from rigging, as opposed to just walking out there and doing it himself?
If it helps, you can always use sensor targeting (p. 184) to do your shooting, which uses Logic instead of Agility. You never actually have to fire a shot with Agility if you don't care to do so.