Since I don't have BFII I do not know if there is something like this.
I think it would be cool to have a training that would be in a Kamino training facility (like in the RC intro) where there are blocks that are used as cover and you fight hologram enemies. This could be used as a beginning battle for some custom trooper campaign where you start out at the lowest rank possible and through each battle you have to complete objectives as well as win. I don't know exactly how the ranks would be determined (rising and demotion in rank could happen).
Some old republic wars other than the clone wars could be cool too.