The plugin works by making use of the engine system for enumerating all actions on an object/class that are accessible through the blueprint graph right-click menu. So I guess that’s why non-BlueprintCallable and private methods may not show up. Solving that would require a complete rewrite of the way the enumeration is done.
As for filtering out some things that currently do get included, that is potentially doable, but there are no settings for it currently, no. And I don’t imagine I’ll have any time to work on this plugin again anytime soon. The code is on Github though if anyone wants to make pull requests.