How to setup persistent property?

[Christophe Lohr]

Hi,
  For my Xorg, I have to setup following property regarding my usb mouse:
hal-set-property --udi
'/org/freedesktop/Hal/devices/usb_device_46d_c016_noserial_if0_logicaldev_input'
--key input.x11_options.ButtonMapping --string "3 2 1"

Now, I wonder how to make this config persistent accross hald restart?

Regards,
Christophe