Nostalrius Begins - Quality wow vanilla realm (1.12)

Is it allowed to kite commanders around using jumping from high ground to low ground and back up again and and again?

Why not? Do it all the time as a hunter, along with other kite methods.

Could kite the commanders all the way to Horde or Alliance NPC's if you wanted to.

Is it intentional that Drek runs slow enough for hunters to kite him, or did that get fixed?