Would be especially helpful here with how bumpy the highways are. The ride-by-wire is pretty sensitive and every bump my wrist twists the throttle a little causing little tiny surges sometimes.It's highly unlikely that the bike is already set up for it. If it would be, why would Triumph not offer it as an option? It would be illogical not to offer it.
I share your sentiments though. I did not buy this bike for touring but even short stints on the interstate I wish I had cruise control.