This is an interesting topic, I've always found it disappointing that an internal applicant for a commission needs to jump through more hoops than old mate who has just walked into recruiting, straight off the street.
Having said that, I do believe that the culture of endorsing all well performing airmen for a commission to be a tad unfair on all concerned. At the risk of sounding like an elitist **** (which is not my intent), I find that you generally encounter two kinds of ex-troops in the officer ranks: bloody brilliant or extremely disappointing, very rarely any in the middle ground.