Putting Netherrack into a furnace should make it glow without smelting

Many of us can agree that glowing furnaces are a very cozy, homelike thing in Minecraft. But they only glow while you're smelting something and turn off shortly after, making them basically impossible to use for decoration. Since fire on Netherrack never goes out, I propose that putting a block of Netherrack in the furnace fuel slot will turn on the fire glow, but won't function as fuel for obvious reasons. This way, home exteriors could be decorated with perpetually glowing furnaces while remaining balanced. Also, since there are several furnace light levels, the more Netherrack blocks you add, the higher that level can go.