What if there was a rate limit instead? Allowing submitting to three jams within the period of a week would stop the spam but still allow participation in extremely long jams.
Viewing post in Jam spam
Well, from my perspective the annoyance would be the same whether it’s clicking “no” on the approval or just doing a normal disqualification the way it currently goes.
The real question is whether the approval step would serve as a disincentive for the spammers so that they wouldn’t even bother submitting in the first place. Hard to say without trying it.