Don’t know if this has come up already, but when you are using Smart Lighting and want to use the tool for Spot Weighting, the little X mark in the upper right corner of the field is missing which was used to delete the field.
When you click there, the field is still deleted, but it would be nice if the X mark would reappear in the future for a clearer work flow. 
If this is already known to you developer guys, the administrators may feel free to delete the topic.
