PJSIP trunk max_retries setting not written to pjsip.registration.conf

When I set a value for Max Retries in a PJSIP trunk, FreePBX does not include the max_retries directive in the generated pjsip.registration.conf

This means my trunks end up with the default of 10 and there is nothing I can do short of editing pjsip.registration.conf manually to fix this, which is pointless since it'll get overwritten.

Please advise, is there a work around I could use to permanently set a different default for my trunks?

Thanks.