Since many of the shared macros here use the same convention, ie
green for comments
I'd say it'd be very useful if KM used a set of default colors when creating an action, that way it's 10x times easier to distinguish what an action is for, and also a time-saving feature for every user.
This enables you to fully customize any Action and then save it to your personal library of Actions. These are just as easy (maybe easier) to find and insert into your Macro as the normal KM "Insert Action by Name" menu.
I use Dan's system many times a day, and have been since he released it several years ago.