If I'm understanding this right then you are saying something along the lines of...
we should be able to include/load in an external .lua file which should be displayed inside of the script section & should update itself whenever we update the file via an external text editor such as Sublime, notepad++ etc?
I too would like to see something like this, but for now I just include a simple script which allows me to link to external .lua files, so that I can write & edit them via sublime text.
http://wiki.visionaire-tracker.net/wiki/How_to_Load_External...