I just tested, and it is currently possible to send a PM to multiple people using commas, but not possible to add extra people into a reply.

I, personally, never use PMs to send, and rarely even reply to people on there, I'll go find an email address out of preference.

Ergo, I voted 'no opinion' as it's not something I even think adds to site functionality. Then, I've always had a publicly listed googleable email address and I know I'm unusual that way.

But I'm fairly sure that the discussion seems to be split between people that view PMs as a sort of on site email system, and people that view them as something copmpletely diffrent from email that should be different.

I'm not sure that those two desires are going to be easy to reconcile.

So, help me out, why and how do you think PMs are, and should be, different to email?