I'm neutral about them. I play games with them already, and games without, and both work fine. I see what you mean about them potentially ruining immersion. While a toggle for on/off would be nice, it might also be good to have a hotkey assignable function. Hold down Alt, for instance, and the symbols pop up and stay that way until you release the Alt key. That way they can be useful at the touch of a button but not ruin the immersion factor of the game by always having them there.
