You want to limit the size of a PING packet? A standard packet is 32 bytes and can grow to 1500 bytes (maximum MTU). You want to restrict the size of a packet? I don't think that SEP would be capable of doing something like that.
You can, using the firewall, turn off ICMP traffic... You can, from certain manged switches and or routers, restrict Multicast and or local segment broadcast...