Grimrock

Why can't I look and move at the same time?
Also why can I only turn +/- 80° and have to release and press the key again to continue turning?

I never use the freelook now because it is simpler to use Q and E to turn than press mouse key, look at wall, look at other walls, release key, walk, repeat.

Why not 360° freelook and still be able to walk?

Free look isn't supposed to your main way of maneuvering. It's to look at your surroundings in detail. A ton of people in let's plays are using this method and wondering why the game is so click heavy.