ORIGINAL: el cid again
In AE they do not dive bomb because they are not so defined. YOU can define them that way, if you wish.
Since they did dive bomb, I have both E8 and F1 dive bombing - and sure enough - they show up with the DB symbol
and everything. You then need to define them as float capable.
Ah yes. There is even such Japanese plane in-game.
Change seems simple enough, however in AE there is difference between dive, and glide bombing. TBs tended to glide, but I think it was reversed in beta.
So, do you have any data which Float Planes could made dive/glide attacks? I am guessing not all of them.