I know that COBOL users are probably a dwindling breed, but I have recently been involved in several new COBOL projects at work that have me looking for the ideal COBOL editor (enter Zeus). I have tested/used OpenCOBOLIDE, a very good tool (Colin does a great job) with its own subtle, behavioral nuances. Two features that would be very nice to have in Zeus would be the ability to have 2 additional margin settings in editor options with the added capability of being able to set the color of all four margin indicators - individually, to help them stand out (I also prefer solid margin lines when editing COBOL). Having these options would be very helpful.
I want to add that I realize it is possible to set the current margin line colors. Font weight options do not appear to affect the margin lines. It seems like all - oh-oh, I'm making it sound simple - that would need to be added would be 2 additional settings for the other 2 common COBOL delimiter/margin lines.
From what I get from reading read your description I'm assuming you are looking to have four vertical regions on the screen with each of those regions being identified by a different configurable background color.
While something like this is obviously possible, it could be a little tricky to implement in Zeus
Thanks for at least considering it. I'm sure there's a lot to consider given the characteristics of true type fonts vs. fixed width fonts and whether the lines would be drawn on the background or at a z-order level above the editor text.