I have used sux without any problems. I think you can ignore those warning messages. sux is used for running graphical apps as root, where "su -" is not possible. For everything I've used it for, it works fine.
"kdesu" is also another way to elevate to root for graphical apps.
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unpleasent problem with sux, see: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=659878
I have used sux without any problems. I think you can ignore those warning messages. sux is used for running graphical apps as root, where "su -" is not possible. For everything I've used it for, it works fine.
"kdesu" is also another way to elevate to root for graphical apps.