Hello Pierre,
as Radius attribute you need only the Service-Type like:
Service-Type=%CUSTOM2%
Corresponding I set the Accept Policy to 
6 in Custom 2. Please be aware of the setting in the Management Attributes field. You need this settings to get access via GUI and SSH to your ASA.
As far as I found out you can not distinguish the privilege level!
Best regards
Stephan

					
				
			
			
				
	Regards
Stephan