That's a nice idea, and a very small amount of people would know how to abuse it in anyway ;3
Thats not entirely true, ive seen people build pillars, set their spawn and jump down to make holes and respawn back up... It only takes one person to realize this and use it before everyone else starts too.
I do think that changing the effect is more logical, if its possible to have hitting respawn as an instant kick, and not the teleportation to the respawn point itself, then lag and respawning could be entirely different kicks...
This all said, I believe the current respawn sensor kick is a 25block radius from where you are when it thinks you teleport... In a sense, if the server doesn't recognize you moving those 25 blocks, thats some pretty bad lag and i feel like even though its not the players fault, it would get very irritating to not be able to catch someone because of their lag.... Not to mention even more frustrating to be caught by someone who appears 25 blocks away then suddenly catch you...
Both kicks are necessary