SVXLink does have a variable called DTMF_MUTING. ORP enables this by default (hard coded). You could modify some PHP code to disable DTMF_MUTING and make it pass the DTMF. It would be an all or nothing approach…On or off. Once version 3 of ORP is released it will included overrides to make this easier.

As for muting this on the RX side for both the main repeater but not on a simplex link, I cannot think up how to achieve this or if it would be doable.