"Context" disabled in "Set Location" when trying to create new Configuration Context

So, according to this article it's not possible to "enable" "Context" field in Set Location window for Save As action.

Now, I'm trying to use action "New Configuration Context" from WTPart. Sadly, here is the same situation - it's impossible to set different context than the one where user is "currently":

So while this is "working to spec", has anyone tried or even been able to found OOTB code that is responsible for this? Is it something totally hardcoded that cannot be changed or was someone able to found + modify (customize) this behaviour?