Navigating main Xfce menu by initial letter -- possible?
Is it possible -- and, if so, how? -- to navigate the main Xfce applications menu by keys other than up, down, left, and right? What I want to do is what the GNOME (and, at least at one time, the KDE) menus allowed: for example, Alt-F1 (or Ctrl-Esc) to open the menu, N for the Network menu, then F for Firefox.
Currently running Linux Mint Helena (based on Ubuntu 9.10, Karmic), but I've tried several Xfce-using distros and never found an option to allow browsing menus by the first letter of the menu section or the application. Searches on Google, Ubuntu Forums, and Linux Mint Forums for "(menu OR applications) (browse OR navigate OR select) letter" (without quotation marks) have turned up nothing useful. I also asked on the Mint forum and didn't get a useful response.