Hey there! Are you familiar with config.adjust_attributes? That's what I'm referring to with short forms. My EasyRenPyGUI template comes with an optional file that has some sample code which you might find helpful, and links to one of Tom's articles on the topic: https://github.com/shawna-p/EasyRenPyGui/blob/main/game/optional%20files/adjust_...
Basically you'd use that to set up your short forms like
define config.adjust_attributes["luke"] = Aliases( scared_e="auto_mouth_scared brows_scared eyes_scared" )
Then you can use the Short Forms tab in the image attributes tool to enter "scared_e" to make it available to the tool, and/or add it to the SHORT_FORMS set at the start of image_tool_common.rpy and reset persistent.
Hope that helps!