I suggest allowing hearths to be crafted with any of the cups, mugs and horns to make what are essentially big torches. Not as big as hearths but not as small as torches. This way you can have interesting lighting, especially at distances where torches are hard to see, without needing to take up two whole blocks. (often more with the blocks surrounding the hearth) All it would be is a cup, horn, mug, glass, goblet or bottle with a small fire texture coming out the opening. The material contained within the container would be a simple charcoal texture to reflect the hearth containing coal/charcoal.
If possible allow bowls to do this too, but if not that's fine.
An alternative method of cup fire is okay since the small brazier is all I'm trying to describe. I feel it would be great for decoration, especially for Taurethrim builds.