Molotovs and knives require 3 ST to throw on 15 hexes.
Grenades require 4 ST.
Heave Ho gives +1 to throwing ST check, and it will exceed a weapons max range if you have 5 ST. I have 3 ST (poor choice), and throw on 15 with two heave ho. With buffout I throw on 21 hexes.
Sneak does affect NPC/Critters in encounters.
Silent death is good with throwing, but not like it is with bursters.
I've got crits from molotovs at around 40, knives around 160, frags around 180, and plasma's at 250.
I was able to squeeze in 300 sneak, 180 throwing, and 116 small guns into mine.
Farming spots for thrown weapons seem to be the same, with maybe some additional spots I can't remember.