One thing I would like to have is an editor that responded to tags within comments (so it wouldn't be a part of the programming lang syntax, but just a convention used by the programmer) which would apply different colors to different types of comments. I would then use a faded color for wordy background info or comments needed by anyone proposing to change the code but not needed for reading the code, brighter colors for brief comments on the intent of a chunk of code (making the code easier to skim) and maybe a very bright color for WARNING, or FIXME, or STUB-ONLY, or TODO, etc.
It's almost like there's a law of conservation at work. The law of conservation of human attention. Comments can be used either as background hum or as salient landmarks.
I think commit messages are the appropriate place for this stuff; I use `git annotate` etc. to find the information when I need it. I often have a 50-line commit message accompanying a one-line code change -- a ratio that would obviously make the code unreadable if all the comments were in-line with the code itself.
Right now I use the Tomorrow Night theme which seems to be okay but I would prefer to have a good light color scheme (the longest I ever used one was Espresso Soda theme).