I've submitted this bug (T29488) with specific needs in mind. There is no way I know to:
- Load user scripts in the header to allow actually running their code BEFORE the page starts to render (needed to inject CSS or faster adding of crucial elements).
- Load user scripts in order (without the need of contacting administrators).
I'm not sure, but I think this probably means we need to provide a way to set position = top on user scripts. Maybe it is related to the need of creating modules from wikipages, maybe not.