In Potlatch, 'Shift+g' shows only your traces and 'g' show all the traces (http://wiki.openstreetmap.org/wiki/Potlatch/Keyboard_shortcuts). But the same shortcuts don't work in JOSM and nothing similar is listed in http://josm.openstreetmap.de/wiki/Shortcuts. Is there a way to do that or should I file a wishlist bug for JOSM ?