it will take you all of 5 minutes to block it off, but is it leaking from the line or from the area that it threads back together? if its at the thread part and you really want to keep your 4ws, drain the fluid and unbolt it and check the rubber o-ring, mine looked like it was coming from the y also and i drained it all out, clean it up really really good, then had a friend add fluid while the car was slightly jacked up so i could fit under it, with the car running and had him turn the wheel left and right and it ended up going all the way back to the rack at that o-ring ther and it was running across the top of the line all the way to the way then pouring out there.
depending on what you really want 4ws or no 4ws depends on what to do, both processes are extremely easy, there are only a few bolts and there the same bolts that have to be pulled anyway. i went with keeping the 4ws because i really like it and i wanted to keep the car as stock as possible, aside from a few things, that are only visual.
its all a matter of preference, do what will make you happiest with the car! /ubbthreads/images/graemlins/laugh.gif