Filter mobile users out of the client

Can we get a filter to hide mobile users in the client? It's annoying seeing people perma-logged in on my friend list that are not actually online to play with. Especially those users who haven't even logged into the client in months and are essentially inactive. I have had to remove the app from my phone and after 3 days I still appear in my friend's friend list. Any idea whether this is being looked at?
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