[TheMilkCarton]

This plugin should be inserting javascript somewhere that has a value called "proximity" lowering this could help, but then the actual icons won't zoom as "fluidly" (As you move past them they'll kind of "pop" in and out of place instead of zoom gradually)

Alternately, you could follow the steps I posted above to download the original Fisheye source, but instead you would change the posy value in the JavaScript to make the vertical range that affects the dock smaller.

I converted mine to vertical though, so I can't tell you what you'd have to change for sure... since I'm not the greatest with math, and the way I modified the JS was more of a "guess and check". =p You could TRY changing the "posy =" line to

var posy = Math.pow(pointer.y - el.fisheyeCfg.pos.y - el.offsetHeight/2,3);

(notice the higher power)... and if that doesn't work enough you can increase it to 4, or just square the "posy" in the distance formula (it should do the same thing).