BenroadsI know it's a bit insane but implementing a bunch of these ideas to AdvSPEC plugin could be crazy awesome. Maybe not the exact k/a/d thing cause I think it's a bit obnoxious and really not needed in tf2 imo.
i'm not sure if blue has had the time to work on anything recently but i know sticky outlines have been suggested in the past as well as a sort of "minimap" overview of a map (maybe even something casters can draw on but this would probably be impossible). the csgo and dota casts' production values are insane now and we can take some stuff away from it.
but honestly advspec is really amazing the way it is right now and blue's done a really really great job doing the stuff that valve unfortunately doesn't have the motivation to do.