Cool - I think this feature is available directly with the service that is downloadable from the F-Script homepage:

"The F-Script Anywhere injection service, developed by Silvio H. Ferreira, lets you easily inject a whole F-Script environment in any running Cocoa application, providing F-Script Anywhere-like functionality…"

http://www.fscript.org/download/download.htm

F-Script is pretty amazing, and was a great tool for helping me to learn Cocoa in particular.