Pass through events to Blender UI

I've been experimenting with creating UI with CookieCutter yesterday and I think I found a significant limitation in the way the whole library can be used. It seems to be impossible (just judging from event passing code) to pass any events to Blender UI when a CookieCutter-based operator is running modal.

I see where the limitation is coming from since it was built primarily for Retopoflow and similar tools implementing their own edit modes basically. But since the modal operators in Blender can be run alongside each other it makes it possible to make UI-only operators implementing no real actions (e.g. useful widgets for viewport or something like that, which could stay open when you keep on working using normal Blender features). So, if that functionality is not supported, I propose adding some functionality to have some control over "allowed" areas where events could pass through, making Blender UI functional.

I temporarily changed in the code in cookiecutter.py to pass through all events, and it seems to be not breaking any UI interaction, dragging or whatever. So I suppose, some functionality like that can be added in theory without too much pain?