Personally I think an ingame overlay that tells you who is talking in what channel would be an excellent feature, say for example where the overlay highlights and distinguishes between those who talk in the main channel, those who use channel commander and those who are whispering to you in different colours or lists so that you can understand who is talking to who at any one time, having to look at a second screen isnt possible for some people is already annoying for those that do because it takes away from whatever you are doing on your main monitor.
I’m not sure if I understood you correctly but doesn’t Overwolf offer the whole thing?
Overwolf doesnt offer any channel commander or whisper list functionality, all it shows is who is talking, not who is talking in which whisperlist. Also I dont think Overwolf support ts5 beta but i might be wrong.