If you do work on configs to make packages harmonize better with each other (or whatever), it's perfectly legitimate for the communities to expect you to contribute these new improved default configs back to the originating projects. Pretty much the only thing that upstream wouldn't be interested in, is trademarked artwork.
Are the pesky Ubuntu developers twiddling their thumbs all day, or actually doing work? If they are doing work, it'd be a whole lot nicer of them to contribute. And since they are a Debian derivative, there is an upstream for exactly everything they do (including little scripts and exotic configs) - except inserting trademarked logotypes.
Then again, they may be very few, and already contributing exactly everything they do - but if that was the case; why the difference between Debian and Ubuntu?