You should be able to still use the 'configure agent' action - i use the c:\ through preference.
Also I had a custom PowerShell script that mapped to the nearest preferred server and if it was not available would map to the next and so on.
However in Provsioning now you can choose the action to map to a preferred server? which version of LANDesk are you using?
Cant you use the Map to preferred server then copy the agent from there to the c:\ - that's what i am doing. Then it acts like the 'configure agent' action.
However like i said that should still be functioning.