I would like to extend the existing set of icons with a custom icon set.

The following properties could be available:

• Specify path to custom icons
  • At least one custom icons path, allowing to override or extend the default iconset of mode-icons.
  • Or a list of paths, seach for icon files in the given order.
• Provide a user defined custom-mode-icons, separated from mode-icons (see note below).
• Optional: specify full path for specific icons.
• Optional: make lookup file type independant (if a file with given name is found, the type could be deduced from the extension)

The reason is, I have a couple of custom modes, not useful for the publib domain, which I would like to see with pretty icons.
A second reason is, that I my be unsatisfied with one or another icon and would like to be able to provide my own version.

Note:

I generally won't customize variable mode-icons, because I want new icons if I update the package. So I plan to append my icons to that list.
Probably a better solution would be to fully customize a custom-mode-icons for that purpose nd customize mode-icons iff I am complately unhappy with the default.