Dwarves are sneaky because they are small. But their other racial trait is strength not finesse, one point in sneaking is hardly more important than 2 points in strength. Also scoundrels have armor pen skills and magic armor destroying cc skill chloroform, wich more fits with additional skills in for example aerothruge for stun. Scoundrel and Aerothurge worked good in D:OS and are still not bad in D:OS2.
But if you want to play a dwarven scoundrel, you will most likely also take Warfare, because armor destruction bonus anyway.
