Yes, particularly when you’re playing out an alternate endgame, and the game is finished, you don’t want to see W+0.0 or B+7.0 even when it isn’t integer komi.
We have about half of what your asking for at the moment
You can basically manually mark the board, points and dead stones stones with the X. I think the calculator tool does actually auto mark enclosed regions, but I don’t think it actually shows the score anywhere, unless anyone knows? @anoek