MintMenu on XFCE: how to bind it to release Super_L instead?

[rkmugen]

I have enabled the Mint Menu on Mint 13 XFCE to be called up right when I press the "Windows key" on my keyboard. However, the way it behaves isn't quite how I want it. Instead, is there a way to call up the Mint Menu only when the "Windows key" is RELEASED? Here's more detail of how I'd like it to work....

• Windows Key held down: Nothing... but it should still allow for other bindings involving the Windows key, essentially something like Super_L+(any other key)
• Windows Key released (only): Display Mint Menu.
• Windows Key pressed and released: Display the Mint Menu.

Or is the "MintMenu.py" not capable of distinguishing key presses vs. key releases?

EDIT: For right now, I'm using CTRL+Super_L to call up the MintMenu, and then Super_L+L to call up the xfce4-session-logout window. It's not a bad workaround, but still...