Gantt - color by progress

It would be great to see some more improvements to the Gantt functions.

One of these in particular would be to color the Gantt chart by the summary of subitems.

For example, say there are 5 sub items on a task and 3 of them are complete, 1 is stuck, and one isn’t started. The color of that main task on the Gantt chart shows 60% of green, 20% red, and 20% grey to correspond with the status of the subitems.