Admin of collection with ability to manage collection, but don't include in results (hidden collection user setting?)

Not sure of the best way to describe/do this - but the idea is to have a privilege level that would allow for having a collection "hidden", yet still have permissions. Example would be a security lead or similar - someone with access to a whole bunch of collections for an org, but you don't necessarily want all of those sub-collections showing up in the search results/auto fill/etc.

A workaround would be "just use an alternate account for the 'administration' function" but that's not always suitable.