I've just pushed through two new widgets for horizontal and vertical metering. Instead of messing with tables you can just set the current level using a chnset as you would do a slider. They are much faster to implement, and much less of a CPU hog in comparison to the gentable method. I just need to update the docs now. I left out any text or markings as I figure this is easily added on a case by case basis.
p.s. the gif below doesn't show the gradients correctly, but on my machine each colour runs smoothly into the next.