Hi Bert,
I feel your pain. We rx lots of controlled meds, and the wait is burdensome.
But I think the prohibition from sending in advance is to require checking PDMP registry monthly. If someone is on Adderall and they have to call monthly for a refill, I check PDMP monthly. If I gave 4 rxs at once, PDMP would only be checked every 4 months.
Not defending it, but I think that is the rationale.
Gene