You can do that now.  At least you don't have to run the report twice.  Go to SD-Q, System Manager and set the Multiple Print Dialog Box setting to A (for Ask).  Then when you print any RTM, after you print or preview or whatever, it will ask if you are done printing.  If you say N, then rather than re-run the entire report, it takes you back to the Print Dialog box.  So you can Preview, then if it looks OK, email.  Or print a hard copy, then email.  Only caveat - do the email last because when it is done emailing, it doesn't come back and ask again.

I vote for Dave's idea. That would work great!