Will we ever see this feature?
I find really elegant, at least graphically speaking, to have a tile that enable and disable the application/call record.
ACR has it and it's super good.
The current icon over the dialer is pretty bad :D:D:D
The "button over the dialer" is used to manually start/stop recording.
You can let the app not show the button by disabling the "Call Settings - Manually Record Calls - Button In Call" option.