So for example we can sert Q, E, R, F in a group and from those 4 key always only the deepest pressed one is actuated, or last pressed one in case of snappy tappy. Preferably make this unlimited so if someone wanted to they could make their entire keyboard a group so only 1 key can ever be actuated at a time. Probably no one would ever go that far but if you were to increase the keys limit might as well make it unlimited so the possibility is there.
A good example, when I reach over the spacebar with my thumb to press C, V, B, sometimes I slightly press in the spacebar as well. If I could make a rappy snappy group of spacebar, c, v, b, then spacebar would never get accidentally actuated as c, v, or b would always be the key pressed in deeper