Updated Sep 29, 2012:
List extracted from the internal asset data table in client version 0.8.6.
Lights Format: type?Group=1&COLOR=FFFFFF (Don't know what group does - seen set to 1 or 2 - objects with integrated lights like braziers cannot use the parameters)
Light-Huge
Light-Intense
Light-Large
Light-Medium
Light-Small
Light-Tiny
Sound Format: Sound?SOUND=Sound-Ambient-Citytavern.ogg&GAIN=1.0
Enviromental Marker Format:
Environment-Marker
Environment-Marker?type=Rotted < - What does this do? It seems to be a dome shaped wire frame marker - I'm guessing it sets the sound and visual ambience of an area.