Linux Mint 13 Xfce - Use Super_L in multiple shortcuts

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http://unix.stackexchange.com – I'm using the XfApplet for integrating the mintMenu into my Mint Xfce installation. As shortcut I defined Super_L which works fine. Additionally I want to define a shortcut <Super_L>r to execute gnome-terminal. Unfortunately the Super_L keystroke gets interpreted and consumed early so that the mintMenu appears and types r into the search field. Is it possible to configure that both shortcuts Super_L and <Super_L>r work properly? (HowTos)