If I render a 5.1 track or several 5.1 tracks without an LFE track activated on the timeline will Vegas render it as 5.0 or automatically add the LFE info from the existing tracks to make it 5.1?
If you render anything that normaly requires something (ie AVI with no video or audio, 5.1 with no .1, or nothing in a certain channel) it will leave what you left out blank. It won't add stuff you haven't put in.