Hi expanism,
I'm glad you like using FormItBuilder. Being the developer of this little program I could perhaps make some modifications to the next version to allow the javascript to be output into a placeholder that you could insert wherever you like in the head. Obviously it is currently inline just to make it more simple to implement.
Please feel free to contact me directly via http://modxrevo.datawebnet.com.au/contact-support/ if you have other issues you would like me to look into.
Hi expanism (and anyone else wanting this),
The current version of FormItBuilder (0.1.9) as of 24th Jan 2012 will include this feature and you can see it documented here