Yes that would be a very useful tool. I suppose if all the other Admin skin options were removed there would only be one choice to have which is a annoying if you had a several blogs set up with different user groups and wanted each group to use a different skin.

Although I can't think why you want to do that, but it's nice to have the option.

Okay so that was easy. Deleting a skin from the skins_adm folder will remove it from the selection menu on the user's user settings tab. I don't know what'll happen to a user who had, for example, 'legacy' selected if that skin is deleted.

My purpose here is that if I do a screen shot to show where in the back office someone needs to be for whatever reason they'll see exactly what the screen shot shows instead of something "similar but different".