I'm building a Shadar-kai Monk-Rogue-Druid and in picking my enhancements I ran into some situations where I questioned whether something would stack with something else.
One of those situations was the Staff Training lines of the Rogue's Thief-Acrobat tree and the Monk's Henshin Mystic tree.
In particular, since I'm investing heavily in both trees anyway, I find it rather tempting to grab "Staff Specialization" (tier 5) in both trees. Would my toon end up with a combined +2 Competence bonus to Critical Damage Multiplier and Threat Range?