[BRX]

Indeed. I think the most natural (user friendly) way is to look up the name in the list, and if it's not there, create a new entry.
The other way around (create new and accept existing) feels artificial.
I'd suggest to move the (+) buttons to the selection dialogs.

You think so? I would've thought you would prefer simply the message "entry already exist. Would you like to use it? Y/N" and proceed from there.

If you have hundreds of creators or other entries it might be quicker and more convenient to have the option just to create the entry without scrolling and checking through the list.