Not to totally self-promote or anything, but you may want to try looking at the http://www.gamesas.com/index.php?/topic/1093197-running4covers-list-of-stealth-mods-2nd-thread/page__gopid__15962755entry15956780, as there are quite a few mods that would qualify as "revamping stealth detection". Personal recommendation would be JogX's Stealth Overhaul, but I would look into this myself if I were you
Best of luck.
CC
EDIT: Note that Wyverex's Deployable Traps, Assassin Tripwires, and Arcanery all add some fun new tools for thieves, but I don't know of any specifically that add smoke bombs... I believe there may have been plans to implement them into Enter the Shinobi, but I don't know if that ever happened.