Index: tools/config.py
===================================================================
--- tools/config.py	(revision be8b5d6f4c9030b583eac0ddf3be2fb14374ac6a)
+++ tools/config.py	(revision 4cc0c9ee2a2687bb25d47f35bb2087c5d1aa7227)
@@ -257,4 +257,10 @@
 			create_output(OUTPUT, defaults, ask_names)
 			return 0
+	
+	# Check mode: only check defaults
+	if ((len(sys.argv) >= 3) and (sys.argv[2] == 'check')):
+		if (check_choices(defaults, ask_names)):
+			return 0
+		return 1
 	
 	screen = xtui.screen_init()