Rather than a true plugin, this is a standalone php script you can use for easy field creation.
1) Download the file and copy it to your boltwire directory. Your installation should look like this
scripts, system, etc.
icons, plugins, skins, etc.
2) Navigate to the setup file in your browser, directly, and follow the onscreen instructions. The URL will be something like http://www.domain.com/boltwire/setup.php or http://localhost/boltwire/setup.php. Anyway, the script is way easy!
If you have a non-standard installation, you may need to open up the script and modify the two configurable variables near the top. See the script documentation. In a default installation, however, this is not needed.
This script opens up several security issues you should be aware of.
First, if your installation password is compromised somehow, others could setup a new field, and gain full admin control of the site. Definitely not a good thing.
You may wish to "hide" the file by giving it an unusual name. And choose a strong password. You may also wish to delete the file during times you are not actively creating new sites. Or put "die();" on the second line when not in use. You can always restore it again later.
Second, on unix servers, the index files this script produces will likely be owned by the web user. Meaning there is an slightly increased possibility (or so I've been told) that the file could be hacked. Furthermore, unless you have root access, php cannot change file ownership.
One solution is to at some point ftp down a copy of the index file, delete the original from the server, and then re-upload your offline copy. This will reset the ownership. If you are on a windows server, or your server is running suexec.php (like many shared hosters, including mine) this security issue will not be an issue.
Another solution is to only install it on your home computer for developing new websites. Then upload the newly created fields to your server. This way you never have to worry about setup.php ever being on a live server.
Anyway, it adds some nice wow & pizzazz to BoltWire, but it should be used with a bit of caution.
P.S. If you forget the password, delete the .htpasswd file in the BoltWire directory. Then you will be prompted to recreate it.