We need multi-tennancy for delivering print services:
by this we would like to see options like being able to allow sub-admins per customer for a set of printer-agents, having accounting information per customer, use customer specific drivers for same printer model without interference.

Might be reached by being able to run multiple print managers per iprint server. This would also allow to restart a print manager for only one tennant. Kind of a single node cluster capability running on secondary ip-addresses or something else.