Tim,
Looking at the graphical tdm greeter issue, I have the same SAK error on R14 that I see in 3513-sru. In .xsession-errors, I get:
[kdesktop] SAK driven secure dialog is not available for use (retcode 6). Check tdmtsak for proper functionality.
I looked at the code in tdebase/kdesktop/lockeng.cc and the correct tdmtsak and kdmtsak executables are being called in R14/3513, so I can't explain this error with tdmrc UseSAK=true??