Add the following two lines to the end of the device list. (Before the line "# The following rule will disable ..."):
7.add user to scanner group
8. To let the scan-key-tool operate it must be started with command `brscan-skey`
Then Scan can be pressed on the machine. scn3...
add it to autostart with @brscan-skey
Try xsane or other scanner app -might not require the scan-key-tool (I haven't tested it yet)