Normally I refer to the users as passers and spinners, no caps and without Baton or Rapid, respectively. Words like "Pursuiter" do come off as unseemly, though... (Is "trapper" okay, instead?) However, I agree; Rapid Spinner sounds worse than Rapid Spin user or spinner.
As for status orb, I would say only use it if referring to both Toxic Orb and Flame Orb at the same time, i.e. "Toxic Orb is usually preferred, but Flame Orb is an option if you intend to stay in for over 3 turns. Which status orb you use depends on your needs." Even in that case, the word "item" works just as well, so it's usually an unnecessary term.