load balance ICMP echo requests to pool members

Additional information: The help text for ICMP echo in the virtual address section states: ICMP Echo Enables or disables responses to Internet Control Message Protocol (ICMP) echo requests on a per-virtual address basis. When enabled, the BIG-IP system intercepts ICMP echo request packets and responds to them directly. When disabled, the BIG-IP system passes ICMP echo requests through to the backend servers. The last sentence describes the desired behaviour, so I guess there has to be a way to achieve this...