For Thin OS this works well, I would not leave the clear TS CAL in the file too long. Just clear the licence and remove the line. WTOS stores the TSCAL information in the NIC EPROM so it is kept even if flashed.
BTW, the RDP applet thing is there on CE 5 but I did not check on CE4x – I have a feeling it may not and will need the addon to remove it,
Cheers,
-TT