Here are the rogue abilities that are built-in to MQ2Melee that got upgraded and their spell ID numbers for rank 1, 2, 3:
respite = Breather (43000, 43001, 43002)
stun0 = Suprise Attack (44124, 44125, 44126)
jugular = Jugular Hack (44136, 44137, 44138)
vigdagger = Exuberant Dagger-Throw (44148...