digiKam, showfoto and Gimp

digiKam is super! But when I edit pictures, I always use Gimp. showFoto I do not need. Can you set digiKam so that you do not open showFoto with the Funkion: Open (F4), but the image is opened in Gimp? It is sometimes a bit too cumbersome for me to always right click on the image and click “Open with” and then select GNU Image Manipulation Program, which is in the 4th position. Isn’t there an easier way to do that?