The thing that nowadays drives me most often to pick up the mouse is when browsing for files, in an open or save dialog. I have been using Dolphin, and I am lacking a shortcut to move to focus to the files pane. Tabbing while paying extra attention to check when it becomes selected is inefficient. In any case, what I'd really like is a file manager with nice shortcuts that somehow gets used by all (most) x applications in their "open" or "save" dialogs, that has some shortcut for that. I don't really know how that works, but I doubt a terminal file manager like "ranger" would do for that. Do you have any suggestions?