I'm not quite sure if this would work with the current system, but plenty of config mods require other mods to work, a way to add dependencies (using Unique ID's?) that auto download when subscribe is used would be a nice addition to the repository, this way people do not have to download multiple mods, and it makes it easier for people to download configs/other mods. A possible concern would be people abusing this to force downloads of other mods that are unrelated.
It would be nice to have it like a button saying "Download Dependencies" so that it would download the other mods that are required, its just a thought... Or maybe a check box you could select, its entirely up to the staff on that matter