To tell the truth, I don't think first requests even can be pipelined, though when it was still a preference I always set it to "true" just in case. I never noticed any performance boost from this one, but included it in the initial post in case it could be useful on some systems or something. Frankly, I doubt adding the preference will do anything for you.
I'll add my vote to that of amznVibe for the "lori" extension. Strangely enough I just installed it yesterday; very nice functionality.