If they really insisted on bringing him back, they should have stuck to the idea that his powers themselves weren't combat-oriented, IMHO.
Having him as the Bosley-type support staff to X-Force, hacking them data on targets and access with his original powerset, would work a lot better and let in a bit more of the moral dilemmas that book needs to explore. (How culpable would Doug be in that role? How much would he be told, and what happens when he starts using his mutant talents to find out more?)
At the very least, they could pair him with Warlock again, and make him the symbiotic pilot of an alien without any understanding of humans ( to contrast him being a character with understanding but no agency ). Giving him Taskmaster powers is a pretty dumb idea; as I've discussed with G:DR here, being able to imitate a martial arts move means nothing if the body doesn't have the reflex, training, and conditioning to pull it off.