Any way to use lua in songs?

I've been playing a lot of Windeu tracks (in fact, they are all I have on my oITG).
Before starting to use oITG, I wanted to see what would happen if I used it on SM5.
No luck, basically. The tracks had no background (but most of the mods worked).
So I was just curious, is there any way to give creators the ability to use lua in songs and courses, similar to oITG?
Thanks in advance.

Yes, it is possible. I'm too busy in other ways to figure out and write a full explanation, but here's a simple example.
In the .ssc file:

#FGCHANGES:0.000=lua=1.000=0=0=1=====,

;

Then create a folder named "lua" in the song folder, and a file named "default.lua" in there.
The default.lua just has to return an ActorFrame with the actors that should be on the screen or whatever.
Simple example, just a spinning white quad:

return Def.ActorFrame{

	Def.Quad{

		Name= "square",

		InitCommand= function(self)

			self:xy(SCREEN_CENTER_X, SCREEN_CENTER_Y)

			self:SetWidth(40)

			self:SetHeight(40)

			self:spin()

		end

	},

	Def.Actor{

		Name= "preserver",

		InitCommand= cmd(sleep, 1000)

	}

}

The Actor named "preserver" is there so the layer doesn't get unloaded.
This simfile has no real steps, it simply exists to show the example pasted above.

I didn't think you could actually use lua in SM5. I guess that's what the .ssc file is for...
Now that I know you can do it, I guess I'll learn some lua. It looks similar to python, so I guess it should be relatively easy.
Thanks!