No, but if you want to open Geany only temporarily and it not interfere with your other possible session, you can run `geany -c someotherconfdir -i` instead of `geany`, so it opens a instance very time, and don't mess with your principal Geany config.
Otherwise, I don't know, a very tiny plugin could do that: send `GEANY_KEYS_FILE_CLOSE` followed by `GEANY_KEYS_FILE_QUIT` on a custom keybinding.