HUD message device has a lot of settings that are hard to understand and weird in most cases. Adding the widget settings on top, sometimes is impossible to get what you want with UI.
A preview button in Live edit, like how third person controls and fixed angle camera have would help us debug the issues straight away without having to wait everytime we tweak a setting on it. Also when we preview on different platforms, it ll be great to see how they see those HUDs too.