I don't think it happens very often. I remember having twitchy fingers on the "Moderate" button (due to alcohol) once, before there was a "consider" checkbox; also "Moderate" was called something else in those days, probably "Submit".

Anyway, I put a request into the CB for the node to be unconsidered, and it was fairly quickly. There's usually a janitor not far away, listening, and plenty of senior monks voting "Keep".

Conclusion: the existing mechanism works well enough; I can't see any reason to change it.