Hardware PTT Button on iOS + Ability to use PTT button when device is locked

The first problem is maybe me beeing to stupid to find it, but I just couldn’t setup a hardware button for PTT (e.g. on my headset) in the iOS app. The setting menu item which exits on the android app, is just nowhere to be found.

And if anyone from TS reads this: a feature request, which would be a massive improvement for my usecase, would be if the mapped PTT hardware button would still work when the phone screen is locked.
This would turn TS into an event intercom system.