Anyone who has tried building a module where lighting is an important element has no doubt been disappointed with the lack of control over the light placeable.
It is a sphere of light that bleeds through walls! I love the controls we currently have, but I find one aspect lacking.
I'm not sure how feasible this idea is; but I'm sure someone smarter than I could do something.
Would it be possible to create a new placeable that is only a 90 degree "quarter-sphere" of light? This would allow for greater control over light angles, and would essentially eliminate (or at least greatly reduce) light bleeding through unwanted walls. Gone would be the wall sconce torches that cast light through the stone wall behind it!