So I reckon we need a few labels for them!
I shall start with
HDAD Hyperactivity Deficit Attention Disorder. Characterised by a distinct lack of mischief, children with HDAD show a distinct tendency to sit down and STFU. Often comorbid with my next suggestion.
Bonum Duo Calceamente is characterised by a constant desire for adult approval. Diagnosis is according to a Triad of Impairment, with marks out of 10 for: Timely completion of school work, including asking for extra when finished; Voluntary completion of adult tasks such as blackboard cleaning, pencil sharpening and tidying of toys; lack of ability to maintain cheek and backchat (in severe cases, this developmental stage will be completely absent)
Anyone care to add to my list?