Expand amount of settings related to who can whisper you.
Currently, "Block Whispers from Strangers" is the only setting that seems to be available for this.
It would be nice to have a list of "types" of people on Twitch and just be able to select who you want to receive whispers from exactly. For example:
Receive whispers from:
☐ Followed Users
☐ Partnered Broadcasters
☐ All users