> [...] it has happened to me too often to select [delete] by mistake > and to delete a window afterwards before I realized my mistake.
there is a patch on sources that allows you to change rio's linear menus into pie menus. this allows you to associate the desired action with a mouse gesture rather than requiring you to either remember the menu state or to always look carefully at what you're doing. since i began using pie menus with rio, my rate of absent-minded window loss has sharply dropped satisfaction guaranteed. and thank you to whoever wrote the patch