Feature request.. Group grouping

I know it sounds strange... but some files need it. I want to be able to nest my groups, color code my groups and so much more. I know I can currently "nest" groups but it leaves the original group visible and clutters up the project. I know I can "hide unused rows" but this is only helpful when a timeline is already created. I understand this would probably be a huge undertaking due to the rework of the API variables... but I need it. I have many buildings with a list of groups that can forever scroll off the screen(see example). 

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