well, you can make then a Icon your self. just open them in W3M Map Utilities and edit the icon, and make a disable icon of and your done. i have a list of some icons you cant see in the editor. Just type in these paths in the "Path enter" thing when you choose a icon. letts see... here we go:
buildings\undead\GargoyleSpire\GargoyleSpire.mdl
Doodads\Cityscape\Props\CityGrave\CityGrave3.mdl
ReplaceableTextures\CommandButtons\BTNVengeanceIncarnate.tga
ReplaceableTextures\CommandButtons\BTNLament.blp
ReplaceableTextures\CommandButtons\BTNOrb.tga
ReplaceableTextures\CommandButtons\BTNForceOfNature.blp
ok?