I think this should actually be the default, with maybe an option to turn it off instead. Apparently libsolv has a flag CLEANDEPS which should already do this for us, if we set it properly? Not sure. Feel free to take a look 
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Actually it just means “installed in system”. (“h” would mean “installed in home”.)
I remember reading about CLEANDEPS, but I don’t think it is exposed-to/used-by PackageKit yet.
Given that (and my lack of skills…), I had more or less an idea of how to implement it (naively, again) using what’s currently there (get deps of the given package, check if they’re --not-required, add them to the “to uninstall” list).
We’ll see if I can come up with something, or fail miserably instead. 
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