Well, he got my e-mail and he's going to wait until June 17. But to answer your questions...
1)Very few schools selectively send out secondaries... almost all schools now-adays send out secondaries to everyone.
2)To my knowledge... after they get your AMCAS application, medical schools just throw everything you send them into a file. They're not going to take the time to see if it's something the requested... they're just going to throw it into your pile until it's time for them to review your application.
3) I don't think you have to wait until you get your secondaries to send out your LORs... especially the basic ones, like 2 science profs and 1 non-science prof. The ones you'll send after you get the secondaries will be specific ones... like for a strange example... I've heard that Loma Linda asks for a recommendation from your priest.
However, a lot of pre-med website say you shouldn't send recommendations till after you get secondaries.... but I don't know if that means you can't.
4) About postage and trees... it's not that much more paper and postage to send out a few extra recommendations... and hopefully, the medical schools recycle 🙂