Great idea was to create the template sensor in the helpers, it would be nice to be able to change the sensor icon based on the result of the template (icon_template). This would allow me to manage all the sensors’ yaml code via GUI.
+1 from me.
and please directly extend with the remaining config options that are present in yaml.
Attributes being the most important for me. But availability template would be nice too. Triggers would be the icing of the cake 
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Not sure why this hasn’t been made a priority?