^ @2tec
You can do something like that already if you sacrifice one of the 4 art threads. I have no use for "Disc" images so I use that for Genre icons in Facets. (What would be more cool is if there were a 5th art thread for external "Icon" images, instead of having them be embedded only...)
Preferences > Display > Album Art, Disc tab goes like this -
$if($or($strstr(%genre%,Country),$strstr(%style%,Country)),C:\Freeware\Foobar2000\profile\icons\genres\country.png)
$if($or($strstr(%genre%,Reggae),$strstr(%style%,Reggae)),C:\Freeware\Foobar2000\profile\icons\genres\reggae.png)
$if($or($strstr(%genre%,Folk),$strstr(%style%,Folk),$strstr(%style%,Bluegrass)),C:\Freeware\Foobar2000\profile\icons\genres\folk.png)
$if($or($strstr(%genre%,Game)),C:\Freeware\Foobar2000\profile\icons\genres\game.png)
$if($or($strstr(%genre%,Metal),$strstr(%genre%,Punk),$strstr(%style%,Metal)),C:\Freeware\Foobar2000\profile\icons\genres\metal.png)
$if($or($strstr(%genre%,Rap & Hip-Hop),$strstr(%style%,Rap),$strstr(%style%,Vocal)),C:\Freeware\Foobar2000\profile\icons\genres\rap.png)
$if($or($strstr(%style%,Acoustic),$strstr(%style%,Instrumental)),C:\Freeware\Foobar2000\profile\icons\genres\acoustic.png)
$if($or($strstr(%style%,Comedy)),C:\Freeware\Foobar2000\profile\icons\genres\comedy.png)
$if($or($strstr(%genre%,Podcast),$strstr(%genre%,Interview),$strstr(%style%,Spoken Word)),C:\Freeware\Foobar2000\profile\icons\genres\vocal.png)
$if($or($strstr(%style%,Gospel)),C:\Freeware\Foobar2000\profile\icons\genres\gospel.png)
$if($or($strstr(%genre%,Radio)),C:\Freeware\Foobar2000\profile\icons\genres\radio.png)
$if($or($strstr(%genre%,Video)),C:\Freeware\Foobar2000\profile\icons\genres\video.png)
$if($or($strstr(%genre%,Classical),$strstr(%genre%,New Age),$strstr(%style%,Celtic),$strstr(%style%,Orchestral)),C:\Freeware\Foobar2000\profile\icons\genres\classical.png)
$if($or($strstr(%genre%,Electronic),$strstr(%style%,Demo),$strstr(%style%,Remix)),C:\Freeware\Foobar2000\profile\icons\genres\electronic.png)
$if($or($strstr(%style%,Dance)),C:\Freeware\Foobar2000\profile\icons\genres\dance.png)
$if($or($strstr(%genre%,Jazz),$strstr(%style%,Jazz)),C:\Freeware\Foobar2000\profile\icons\genres\jazz.png)
$if($or($strstr(%genre%,Funk),$strstr(%genre%,Soul),$strstr(%style%,Soul)),C:\Freeware\Foobar2000\profile\icons\genres\funk.png)
$if($or($strstr(%genre%,Blues),$strstr(%style%,Blues)),C:\Freeware\Foobar2000\profile\icons\genres\blues.png)
$if($or($strstr(%genre%,Pop),$strstr(%genre%,Stage & Screen),$strstr(%style%,Soundtrack),$strstr(%style%,Musical)),C:\Freeware\Foobar2000\profile\icons\genres\pop.png)
$if($or($strstr(%genre%,Rock),$strstr(%style%,Rock),$strstr(%style%,Live),$strstr(%style%,Psychedelic)),C:\Freeware\Foobar2000\profile\icons\genres\rock.png)
Incidentally, I still have Disc.jpg images in the album folders that can be displayed by SMP script, so nothing is really sacrificed.
(See here the icons on left of screenshot to give you an idea...)