You can /autofire with any class that has thrown items they can use, and until you get AAs, there won't be much difference in dps with that of a Ranger, as the chance of crits without AAs on the Rng will be fairly low and not add alot. Even with AAs, unless you have crappy melee ratio weapons, no AAs other than in bowing specifics, for the majority of levels, the Rng dps comes from melee. Bow dps, is generally just when using Trueshot disc along with bow AAs, and even then it's generally just similar to melee dps with discs.
Anyway, the point being, personally I wouldn't pick a Ranger for a kiting box. Mage is a much better pick, as they can summon item they can throw, turn pet taunt off, and set up a macro or two (one to assist the necro, send in pet, autofire and cast 1st nuke, and a second to cast the secondary nukes) and you won't be doing any more than a Ranger personally, but have at least 3x the dps, if not way more.
Turning pet taunt on and off is the main source for aggro on pets. The earth pets will root and get proximity root aggro, so is why it was not recommended for kiting. The air pet is a good all around melee pet with stuns, which can make them appear to get aggro, but not usually if taunt is off, especially for a necro with tons of aggro from snare, debuffs, and dots. As mentioned, sitting aggro is huge also.
Just my 2cp, and I love Rangers, just think it's a bad pick to combo with a necro for afk-ish kiting. Another thing to note, is afk-ing the Rng will lead to alot of missed dps, as range and view will make the target non-attackable by the Rng when kiting. It's very challenging to keep a mob in a tight circle that is always in the Ranger's view (i.e. no terrain deviations or objects).
Yther Ore.