As near as I can tell, the RAW does not allow for creating a damage + aspect spell. It says you need to choose one of (attack, block, maneuver, counterspell), and damage+aspect would be two of those.
That said, I don't see a problem with splitting the allocated power of the spell between two different effects, so long as the target was the same. So, for example, you might have a power 6 spell that was aspect(non-persistent)+weapon:3; the control roll would need to beat the total power, and extra targeting shifts would increase the stress inflicted by the attack. (This, of course, would be a house rule, not RAW.)
That said, I'm not sure that doing so gains much. After all, damage is just a meatier way of applying more lasting and debilitating aspects on a target; by splitting the power, you are reducing the potential consequence inflicted. So why not keep the extra stress and inflict a bigger consequence (or an additional consequence)?