What about this?Junker Ju 57 having 2 supplies crates.It would be great on Crete so you can have small baze made from Squadleaders and supplies there.
Secon thing is recon plane have ammo box with parashute because they are too small to carie big supplies. This would become recon plane more usefull because a lot of guys dont want to drive it( and look for enemy) and then they dont get point for it (What i know is that when commander trows suplies and somebody use it then he gets point for it,am I right?).