Bus 429,
The idea of requiring a pilot to be licensed for engineering tasks is an interesting one but it should be borne in mind that the more engineering quals a pilot is given, the more an employer will use them.
Even seemingly simple or basic tasks tend to be type specific, as Blacksheep has said, requiring one to one training so it is likely that the employer will be paying for it, at least in the short term. That might just give employers an opportunity to do without another engineer or two.
In what areas do you engineers feel that a pilot's knowledge is lacking? Serious question.