I have been asking for the same for a couple of years. But you know what they say, there's strength in numbers.
By the way, I know they tell me that the IPAM load on the core server is almost none, but I rather for it to be really none.. In my plan, all of the IPAM polling (i.e. ICMP, SNMP) and management of DNS and DHCP servers would be handled exclusively by my additional polling engines. So, all IPAM would do on the core server is to process the requests, handle reports, alerts, etc.