Some billing systems require RADIUS attribute NAS-Port-Id in Access-Request, will be helpful to provide possibility configure this.
[ppp] unit-preallocate=0|1 By default is unit-preallocate=0, ppp unit (interface) will allocate after authorization. Specified will accel-ppp allocate ppp unit (interface) before authorization, so Nas-Port and Nas-Port-Id would be defined in Access-Request phase.
I propose to add this feature to the RADIUS CLI path
set service pppoe-server authentication radius preallocate-vif