Would center channel benefit audio only room?

A left/right/center blend is a classic loudspeaker setup. Many of the great Mercury recordings of the 50s were recorded in 3 channel stereo. In the 60s Dynaco had preamps that would process 2 channel for a pseudo 3 channel effect. Currently, I believe the Meridian processors have a tri-field process. About a decade ago I heard a demo that was quite good. I'm not sure why people are dismissing this out of hand. It's not to be confused with home theater.

To the OP - this is not your first post on this subject. As far as I can tell you are refusing to give relevant info about your current system and room. People have asked and you do not provide. It really hinders the ability of anyone to help you.

I may be lost, but I don't have any problems with soundstage height!

Seriously, now that you've fleshed out your situation I haven't a clue as to what you should do.

Orpheus10, compare this post to your post. Pay particular attention to the info the poster provides. He even included a picture of his room. Then pay attention to the quality of the responses he got. Everyone here actually wants to help, but you are being really stingy with info. It's been my observation that the more and better quality info you provide, the better the quantity and quality of the advice.

That said, soundstage height is an issue I know very little about, so it's probable that I won't be able to help you. However, I'm sure there are more knowledgeable people than I on the subject who would gladly assist you.