Out of Line?

Fr. Hamilton at Catholic Ragemonkey has posted an interesting anecdote about a non-Catholic who tried to receive Holy Communion from him. While I agree with most of his points, something he said at the end disturbed me.

"[T]he line for Holy Communion is only for those actually receiving Holy Communion…[and] is not for blessings of kids or RCIA people or non-Catholic visitors, but only for the reception of Holy Communion."

I do not understand why those wishing to make an act of spiritual communion should be discouraged from seeking a blessing. Actually, I don't see why anyone should be discouraged from entering the communion line, so long as they are respectful and reverent. Any thoughts?