roster,
You certainly can do that, just make sure that they are sealed in an official manner, or some schools will ask for you to resend them (if they appear to have been tampered with, etc.).
Keep in mind that schools won't process your application until they actually receive it from AADSAS, so the only benefit to you sending your stuff in directly to the schools is to alleviate your worries about AADSAS being slow or losing it.
With the earlier batches most everything was mailed at the same time (schools got my transcripts, application, and LORs all at the same time). From postings by other applicants who applied recently, it appears that things are being sent at different times, in which case it might be better for you to directly send them.
Above all, like I said, it does you no good to have the transcripts and LORs sitting at the schools if they haven't received your application. I'd say your application will get to the schools in about 3-4 more weeks still. Good luck with everything!