How do I shut off auto save for drafts while composing or change the frequency?

I want to eliminate some of the past reply's and attachments when replying to mail.  Is there a way to slow down the frequency of the saves?  With the auto save on, it saves them all even if I eliminate them while writing the reply.  Then when I hit send, it sends the whole batch.  Please don't tell me to save the draft and then continue writing and quickly take out all the extra stuff and close it before it saves again.