Index: trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPreset.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPreset.java	(revision 3278)
+++ trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPreset.java	(revision 3279)
@@ -224,4 +224,6 @@
         public String text_context;
         public String locale_text;
+        public String value_on = OsmUtils.trueval;
+        public String value_off = OsmUtils.falseval;
         public boolean default_ = false; // only used for tagless objects
         public boolean use_last_as_default = false;
@@ -249,5 +251,5 @@
                 oneValue = s;
             }
-            if (usage.values.size() < 2 && (oneValue == null || OsmUtils.trueval.equals(oneValue) || OsmUtils.falseval.equals(oneValue))) {
+            if (usage.values.size() < 2 && (oneValue == null || value_on.equals(oneValue) || value_off.equals(oneValue))) {
                 if(def)
                 {
@@ -260,7 +262,7 @@
                 // all selected objects share the same value which is either true or false or unset,
                 // we can display a standard check box.
-                initialState = OsmUtils.trueval.equals(oneValue) ?
+                initialState = value_on.equals(oneValue) ?
                         QuadStateCheckBox.State.SELECTED :
-                            OsmUtils.falseval.equals(oneValue) ?
+                            value_off.equals(oneValue) ?
                                     QuadStateCheckBox.State.NOT_SELECTED :
                                         def ? QuadStateCheckBox.State.SELECTED
@@ -294,6 +296,6 @@
             // otherwise change things according to the selected value.
             cmds.add(new ChangePropertyCommand(sel, key,
-                    check.getState() == QuadStateCheckBox.State.SELECTED ? OsmUtils.trueval :
-                        check.getState() == QuadStateCheckBox.State.NOT_SELECTED ? OsmUtils.falseval :
+                    check.getState() == QuadStateCheckBox.State.SELECTED ? value_on :
+                        check.getState() == QuadStateCheckBox.State.NOT_SELECTED ? value_off :
                             null));
         }