I had the same concern myself. I thought that strapping a dead weight at the end of the lever would negate the connection between the input and the response. But the shift mechanism is not as simple as a pendulum swing. There's cables, a rotating mass assembly, bearings, and a variable moment lever arm. I don't want to get too off topic and turn this into a physics problem but the fact of the matter is that the shift mechanism in this, and most modern cable driven transmissions, is a topic of separate discussion. Its not as linear of a response as one would think, i believe.
In my mind a heavier shift knob lets gravity do some of the work for you. For a daily driver where you sometimes are stuck in traffic this may be exactly what you're looking for. Instead of spoon feeding every shift into its gate, you grab the knob (and with a controlled and rehearsed motion) flick it in place. You're still doing the work but the effective travel is shortened a little, if that makes sense.
Now the amount of control is what you want to be after. I believe that finding the perfectly weighted shift knob is like trying to find the right jean size at your favorite outlet. It all depends on your taste, brand preference, and size.
I went with the
270g shift knob from boomba. It comes in four colors, but there are honestly hundreds of others on the market so decide for yourself. But what I like is that its only 75% heavier than stock and has, like they state, 'excellent heat management'. My only complaint is that the anodized top insert faded a bit over time. Otherwise I feel its a worthwhile investment. 10/10 would buy again.