xmodmap for key combination

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http://unix.stackexchange.com – With Logitech K290 keyboard via USB, F. keys are not accessible by default, and I need to press Fn before using them, which is not really usable. The Fn key alone does not fire any event in xev. Pressing F1 without Fn fires two key events, keycode 50 (Shift_L) and keycode 133 (Super_L) and displays a message "Touchpad disabled" on my Kubuntu (the same message for every keys F1 through F4) Althoug most media keys works, I'd rather have direct F. keys access. Do you know of any way to toggle Fn behavior? (HowTos)