I often fly the JU88, knowing if a fighter appeared I'd have an 'interesting' time of it. I have to agree that the JU52 and maybe the He111 (and the Do215?) would be a cool addition for the earlier scenarios. 
Anyway, think of the perks you'd get if you shot down an LA with a Ju52? 
 It would be nice to balance the sides up a little. E.g: -
-   German, Italian and Jap transports
-   Italian Bombers
-   British, American, Italian and Jap tanks
    (did I really say Italian and Jap tanks? 

 )
-   British and German coastal vessels
...hmmm - a lot of work methinks.