First report already has a developer response:
Second report was not a bug, but a suggestion and was already forwarded on the RU forum:
Third report is also not a bug. It has tracking radar, and it works as any other tracking radar in the game. As for "Passive Direction Finder" (пассивный радиопеленгатор), we don't have such mechanics in game. So it's a feature request, but not a bug.