Re: YES, RIG\'EM&ROLL= one of the best things !
The post I did at first was of a couple of dead trees. You do have to keep in mind the different weight distribution of a dead limb. (Rig point is typically a littlecloser to the trunk due to smaller limbs losing their weight faster than the part with heartwood)
I guess really dead trees near really sensitive targets, like the one Mark Adams did over a cemetary (See building a ramp for a crane...)would be best done with slings, tying into the crane, etc.
For the most part, dead limbs that aren't badly decayed or obviously weakened, should be OK. The operator has to use his judgement, of course.