using <app name="Settings Manager" cmd="xfce-setting-show" icon="gnome-settings"/> in menu.xml
not getting Actiongame submenu when using Categories=Application;Game;ActionGame; in my .desktop files
Don't be so f*nky annoying with your bumps :-x. Not answers means nobody knows how to solve this.
This is probably b0rked, if you think it's _that_ important, report a bug, maybe it will be fixed in the 4.4 branch, but 4.6 with have a completely new desktop menu backend, which will likely fix this kinda stuff.