FR: Load Form Templates from Filesystem

while using the on page-editor is sufficient for very basic forms I prefer using an external editor or IDE for creating more complex forms. Aside from syntax highlighting I can enjoy version control this way.

However it is a bit tedious to copy/paste the form code on every change. Therefore I was wondering if it were possible to load the template code from filesystem.

One simple solution might be a hook which fires before any form template code is parsed and which provides the id of the current form. This way one could set the template codes by loading it from filesystem or even generate it more dynamically.

Do you see any chance that such a functionality might be implemented? I guess many developers could benefit. Or is there any way to support the implementation?