u serious? ur saying that an s2000 shifter is long? :screwy: Ever driven a Civic Si? Integra? Those are lengthy throws on those cars.
To answer ur question, if u cut it, would it still function ok, yes, look ok? maybe, as for durability, well since your cutting the metal and then welding, no matter how good of a weld it is, its not going to be as strong as before, ive seen shifters break cuz people cut them, then again ive seen some last pretty long before they did.
i would recommend just leaving it alone, and if you really want a short shifter (that is short throw (Some are actually "SHORTER") buy yourself a brand name one, dont cheap out on the s2000. I mean if you can afford the s2000 you can afford 150 bucks for a decent shifter