I had an sp01 Shadow SA/DA. The stock trigger was somehow better that what I have on my Tactical sport, infact, the break was at par with competition .22 pistols. No creep etc etc.
I also wanted to get rid of the take up slack, and decided to got the SA way with the below trigger
http://czcustom.com/testproduct-132.aspxThe problem was, I shifted the very next day back to SA/DA trigger. Reason, some minute slack still remained (one millimeter or so) to allow the trigger to reset, and I just wanted touch and go stuff. This disappointed me. I fear the same for you. I recall Stuart or Cesar advising me against it, now I know why.
Yes, you will have to remove the disconnector. The flat trigger also didnt suit me much for the 100 odd rounds fired, original curved was better, so is the factory tactical sport trigger.
If you truly want one, I think you may have to get it custom fitted by czcustom, or one of schmeky or Stuart might be able to help you out.