Engineering is still worthwhile (even if not a gnome), more so now that CC is so important to actually kill anything. Gnomes get Mortars, instant bombs that disorientate the target, non-engineers get Big Bronze Bombs, which are pretty much the same as the mortar, but have a 1 second cast time. Both are an extra CC ability on a 1 min cd, which beats out the crit from skinning, or stamina from mining by a longshot imo - the only downside really is having to keep restocking on bombs, and the mats can be a bit expensive.