Kethrian, you do realize that if what you say is true then Rogues dealing SA with splash weapons are not possible? Or SA'ing from hiding for that matter?
Rogue: "Okay, I'm gonna hide and then throw that acid flask at the enemy getting big amounts of SA."
DM: "Nope, the enemy auto-detect the incoming flask. no SA. Oh, and he knows the general direction from where he was attacked."