Nope, it is not possible.

Yes but I think it was conflicting with
Post by Proxy - Let your staff post using another username(s)

But with this new 3.6x version they both work great;)

Thanks for the update Anthony:)

Updated

Why would you want to have both hacks installed at the same time?

Because I can send pm's using other accounts ;)

It's not working for me. When I edit the poster's username, it removes the old username but doesn't add the new one in.

Any ideas what might cause that?

It works fine for me on vBulletin 3.6.4.

PV, I am absolutely TERRIBLE with installing these types of things and I know I'll be spending days trying to figure out how to get this on my forum. So, if it's not that much of a hassle, do you think you could install this on my weightlifting forum (once I get it up) for me if I give you access to the admin panel?

That's good.

For me, when I try to change the member who posted the message, it deletes the old username but doesn't add in the new one.

Any idea what can cause that?

It works on an unhacked installation, so the problem might be caused by another hack.

I've tried it on test forum and have the same problem. No other hack installed, original style, original files.