diff -r b35d49cdf30f -r ad8c900d87e5 client/js/defaults.js
--- a/client/js/defaults.js	Tue May 14 14:40:31 2013 +0200
+++ b/client/js/defaults.js	Wed May 15 15:40:09 2013 +0200
@@ -57,6 +57,9 @@
         /* Show circles for nodes */
     clip_node_images: true,
         /* Constraint node images to circles */
+    node_images_fill_mode: false,
+        /* Set to false for "letterboxing" (height/width of node adapted to show full image)
+           Set to true for "crop" (adapted to fill circle) */
     node_size_base: 25,
     node_stroke_width: 2,
     selected_node_stroke_width: 4,