That's going to be difficult. LANDesk uses a registry key on the Core Server to keeptrack of the number it has to give (HKLM\Software\Intel\LANDesk\LDWN\CustJob\PC-nnn and the DWORD name is ComputerNameRuleCount). So it just adds 1 everytime a computer gets this automatically generated name, it doesnt keep track of open spaces in the sequence after you delete computers from the DB. This probably can be done with some adcanced scripting and SQL queries, but it has the risk that you hand out double computernames if a computer is deleted from the DB but still active somehow/somewhere.
Hope this helps you a bit on your way...
thanks for your reply. Helped me a lot :-)
I'm not happy with that, but at least I know that it's naturally not possible to relize! :-)