My starting bridge officers have tractor beam, high yield, and emergency power to weapons. They're all equipped, with their abilities on the lower right clickable and usable (assuming, in the case of tractor beam, I have a valid target selected and in range).
Unlike in beta, though, bridge officer powers don't seem to automatically get assigned a hotkey. So I did it manually, right-click-and-dragging them to the Alt- level of the quick key bar. But for some reason, tractor beam refuses to let me give it a hotkey.