I've never used my GMail account, because bsimpson is a common name and I get all kinds of spam/wrong addresses there. I have Google Apps set up on domains I control for business and personal projects. G+, like GMusic, Wave, and all the other cool Google goodies, launched for GMail only. So, I made a G+ for my GMail address.

Then, I heard about Data Portability and the ability to migrate G+ accounts. "Finally, someone at Google understands that people have multiple accounts!" I ran their app, had my account frozen for a week for the 'migration', and created a new G+ for my personal domain. Bizarrely, they didn't delete my old G+ account.

I used to have a G+ account tied to the wrong e-mail address. Then, I tried Google's roundabout solution. Now, I have two G+ accounts. =\

The support for that isn't in G+, it's in Gmail. Gmail supports sending and receiving mail from multiple addresses. The other addresses don't even necessarily have to be Gmail accounts. It's easy to link all your email accounts together into one Gmail inbox.

Yes I am aware of this feature in Gmail, but this is not what I am referring to.

What im referring to is when contacting other people through g+ it uses w/e email address is associated with g+. This is not always idea, I don't want everyone to know about my email address. Even if u have another email address it is impossible to contact other users using anything but the one email address associated with the account.

Also afaik you can link other NON google email addres, just not other google accounts...

You can link non-Google email addresses to Gmail. Even if they don't support mail forwarding natively Gmail can retrieve the mail from them using POP3.