I think this move scores big on the generality, but it doesn't help draw out detail on the new shape much, and it may not be interesting enough to hinge a class on. That's fine if the druid also casts spells, of course.
Yeah, I think our direction on the Druid is quite a bit different. My druid is far more traditional D&D Druid where Wild Shape is simply an Advanced Move you can take, and spellcasting being a big part of the Druid (very similar to the Cleric spellcasting, but with different spells).
I'm going with the 3 times per day, per the 1E PHB. That was the inspiration for the Hold mechanic. :)
But, these are good thoughts. I like the "Adaptations" rule, and may go with something like this: If your new form would aid you in a move, tell the GM how, and take +1 on that move.
Therefore, a Druid shapeshifting into a bear, describes how he's powerful and has claws, so when Hacking and Slashing takes +1 on the roll.