Always send ANSWERED_ELSEWHERE

I’m looking for a way to add extensions to a ring group after a delayed time without displaying a missed call message on the already ringing extensions.

For example:
I have two extensions which should ring first. They are normally able to pick up the phone with in a certain amount of time. After 15sek or so I want to add additional extensions to the ring group so they can pick up the phone. Until now I did this with a second ring group which I added as “Destination if no answer”.
The problem with this is that the extensions ringing the first get a missed call on their yealink phones whenever it switches to the second ring group.

To fix this issue I added a new "always" option to the ring group module. See the attached code example. Can someone add this or something similar to public module?