Out of fun, I implemented the automatic package addition The attached patch contains proof of concept solution, it might be possible to do it simpler, I'm not sure.
The idea is that if Assist is used to select #include file, it is checked if it comes from a U++ package and if this package is not present yet, it is added to the actual package. Can't be much simpler than that
Honza
Not sure how or why I have missed this one, but it is now accepted into the trunk - I have only simplified it a bit and also added Prompt confirmation.