PMP 450 DHCP Relay Agent - Do not overwrite existing DHCP Option-82 Packets

We often have a large site with PMP450 APs, and downstream site also with PMP450 APs. We’d like to use the “Only Insert Option 82” feature on the downstream AP, but the problem is that as the already-relayed DHCP packet flows through the upstream AP, the relay information is replaced and thus the downstream sites cannot use Option 82 DHCP.

Basically, we need a simple checkbox in the GUI:
Do not overwrite existing DHCP Option-82 Packets