Not really. If you call in a strike, then it'll be available for you to use, but the AI won't make use to it. In other words, if you use your binoculars and then hop onto a mortar, it should be there. I play coop with one other person, and we can use this to good effect.
The AI is pretty proficient with the arty, but it is sometimes a shame that they can't drop it where you want them to! Probably just an engine limitation.
If you look real hard, I think there actually IS a level where you can do off-map artillery, IIRC... probably one of those older desert maps...