i have a samsung scx-4725fn mfp.
everything worked ok except the root thing for the scanner.
i tried your idea:
a: in a terminal, type "sudo chmod -s /usr/bin/xsane"
b: sudo edit /etc/sane.d/dll.conf, and comment out (add a "#") in front of the line that says "smfp" (probably the last line).
If you only do (a) and not (b), xsane will crash.

my scanner is not detected anymore.

is there anyway to reverse command "a"?

command "b" i can change back. should there be " around the #?

i am not complaining. any tip or help would be appreciated.

thank you