1. I believe the correct lines are in `zp-core/auth_zp.php` lines `139`-`140`. I think that, currently, the only way to edit the message is to manually edit those lines.
2. A good way to do this is to set `queueSizeLimit` dynamically based on how many images are currently in the album. To find out how many images are in a user's album, you can use Zenphoto functions (or even a filesystem call if you have a way of determining the user's directory name).
So if you have the maximum number of images per album defined, you can do something like:
`queueSizeLimit = MAX_IMAGES_PER_ALBUM - $currentUserNumImages;`