As this isn't Linux-specific you should make your request in the regular Steam forums too.
Thanks! I hate to ask - but can you point me in the right direction in the forums to request a feature? I posted a question in the All Discussions > Steam Forums > Help and Tips, but I don't think that is the right place - I only got a response saying to use parental software outside of Steam (which isn't really helpful as that doesn't actually solve anything).
EDIT: Nevermind, I'm an idiot - will post in Suggestions/Ideas (Was looking for a 'Feature Request' forum)
Nothing extracted yet.
Not sure if this would be considered a bug or a feature request, but it would be nice if we could filter out games that have been added externally in Family View. My example unfortunately comes from the Windows client where I have added Dead Space from Origin, but don't want that game showing up in my Family View.