Hi,
I have discover something : If you don't want the automatically mounting of your usb device, you have to do that in the kde environment :
- open Konqueror
- select the icon called "storage media" on the left side.
- your usb key must be shown on the window (on the right side). Then right click on your usb key and chose "Properties"
- you can deselect the "automatically mounting" by left clicking on a check box if you want, changing the automatic mount point, and adding the Synchronous option.
PS : sorry for my bad english, but I hope that informations will help you.