Minimum width of custom metadata fields in outline

Searched on this couldn’t find anything… is there/ could there be a way to further reduce width in outline view as my files are only need to be one text character wide but I would like a lot of them. I am using the fields to assign a number to suspense level in plot lines for each scene. Currently the min width is about 4 characters for smallish characters.

There isn’t currently anything beyond what you see when you drag the header line over, but I’ll put it on our list of things to look at, when custom meta-data is overhauled in the future.