If there were a gameplay function for SAR, then the H6K (or H8K) and PBY would be GREAT additions.
The nature of the ToD might open up the possibilities for this type of role. Even without the ToD, it may fit nicely in scenario and SEA play (taking Kadesh as an example).
But it may be asking too much to add gameplay changes in order to justify new Aircraft when there are many aircraft that can be modeled within the current game design. On the other hand, Bullethead and I had a conversation about planeset development a few years ago, and nobody in the thread saw the gameplay changes that would come with ToD, and the change in airplane emphasis that the ToD would have (namely in my mind, reducing the demand for MA fighters, and increasing the demand for "fleshing out" specific periods and theaters of the war).
I think that at this point in time, with the ToD as the apparent future of AH, that when looking at what planes "need" to be added, that we look at it from the "fleshing out" perspective. Artiks post is an example of this type of thinking. My interests are more in the Pacific, so if it were my world:
Early-Mid Pacific
Imperial Japanese
Ki-43 Hyabusa
A6M3 Zero
Ki-45 Toryu
G4M Betty
United States
P-38e
B-17e
P-400 (P-39D?)
TBD Devastator
I think that would work. If you could pick one single time/theater to flesh out, what would it be, and what planes would you want?
-Sik