Conditional formatting extending to groups

I have a rather large document keeping track of things with several groups, it is rather difficult while scrolling through the table to keep track of where I am within the table. I have conditional formatting on the columns that I am grouping by, could that formatting be carried over to the group headers? Or perhaps a horizontal line break which is the colour of the formatting applied to the parent group (in the case of multiple grouping)?

I realize this is only really an issue for me with the white theme of Coda.
Is there any plans for adapting a dark theme?