Support Board

The trade dots feature mentioned above would also be great.

One of the reasons is to see where there is a large "collision" with resting paper/liquidity, shown where there is a big circle at a very bright area that has been present for some considerable time. As mentioned above, it is much more useful if the trade dots/circles have a diameter that reflects the actual trade size rather than a one sized dot fits all.

Another idea would be to have a shortcut hotkey to turn off and on the depth brightness bands so you could for the majority of the time have a clean chart and occasionally hit that hotkey to see where resting liquidity was in relation to what else is on your chart. That way you could get the best of both Sierra and Bookmap without having to take your eyes off the chart you were watching.