[eluser]Derek Allard[/eluser]
My pleasure. RFC's are important, but only if they dictate real-world use. Sometimes they need to be broken for practicality's sake. Email sending is a good example of this. Since the + does tend to get used, it seems a logical choice for inclusion (thanks for raising this).
I'm going to not add in the fix for a few days, and leave this thread open in case anyone from the community wants to add more. If after a bit of time there's no more feedback, could I ask you to just bug me and I'll get it in there for you?