Is manual switch to spec after dead, to avoid spawntime cheating?

[Fate]

Technically no, it's not cheating (unless your definition of "cheating" includes any means of gaining an unfair advantage, but in this case everyone can do it so it's not "unfair").
It's an abuse (as what Casius said) of a "bug" (I don't know what else to call it) to get an unfair advantage.

Is it worthy of a ban? Yes it is.