There should definitely be some sort of block you can place to shed light in underground tunnels so you can see what youre doing in order to make better tunnel and cavern systems.

It's pretty well lighten, I don't think we need this.

nope, the walls often become pitch brown and nomatter what block you place you cant tell what it is, this will be much needed.

I support this. It'll make picking off helpless deuces even easier. You know they'll run around with it above ground. :D

I've always said the lighting in this game was pretty terrible, but I don't think we need this, honestly. This just sounds like it'd be cosmetic. I used to agree we needed flashlights, though. I've changed my opinion about it.

nope, the walls often become pitch brown and nomatter what block
 you place you cant tell what it is, this will be much needed.

yeah if we were looking for iron or landmines..
right now, the fewer blocks between you and the sun, the brighter things are. So its pretty easy to tell how close to the "grass" you are.