Would races with another organization (i.e. you did run some races, just not with SCCA) help or hurt such a waiver after a single season w/o SCCA races?
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I am told that it can help. I am aware of one person (who has only raced in one SCCA race in the last 2 years) who was told by their DLA that if they successfully finished a NASA weekend, they would waive their participation requirements for a regional license. Officially, technically, it has little bearing - but in real life, it can't hurt.