Princess Märtha did indeed indicate that one of the reasons she dropped the HRH was because she wanted to cut down on her engagements. However, the illness of King Harald proved (at least to me) that she is still needed. He is now back in business, but the Crown Princess is still taking care of her young daughter, which is probably one of the reasons Princess Märtha has quite a few engagements also this month. Personally, I don't think dropping the HRH title made any difference, and it wasn't such a good idea. People still treat her as a Princess, and she is still needed to perform royal engagements.
The Princess will have another tour of reading fairytales in September, and will together with her husband move to New York this autumn. Obviously this means she will not perform many engagements.
The Norwegian constitution clearly states that no citizens can have titles, except those in line for the throne. Thus King Harald could give a title to Maud Angelica, but not to her father.
Regarding Orders - Ari Behn is not likely to receive any Norwegian ones, as he does not do anything to deserve them. His position is the same as Princess Astrid's husband Johan Martin Ferner, and he has not received any Norwegian Order. However it is very likely that Ari will receive orders from foreign countries if he is present during state visits. Especially visiting monarch might give him orders.