The /in commanad was first found in Chronos, which was a Cosmos library. Chronos.schedule was the function created to allow this command. This feature was duplicated in the Ace library and again in the Ace2.0 libraries. The advent of Ace3.0 saw the deprication of this ability, because it was of little use. The /in command can no longer be used in combat, if you flag for comabt with a delayed action such as /follow in the queue, the action will not complete till after combat has completed. If you enter combat with a long scripted play already in progress it's possible to spam yourself right off the server after combat, so use it wisely.

So there really isn't too much worry of automation, as /in can't perform anything considered protected such as movement or casting spells.

Anyway enjoy it while it's available...