I always thought the PBY would be a good plane to add on maps with the regular (non-airfield) ports. You could have them available to launch in the water like a pt boat, enabled as long as ord is up for an ord loadout or as long as troops are up for troops. This would make porking port more important and defending or attacking it more interesting.
Another possibility...since this plane was so versatile in WW2...suppose you could launch from a cv group with supplies, troops or ord? Might seriously reduce lvt usage but otherwise could amount to some fun. The cv group already has a spawn point in the water for boats, so it could be spawned right there and go.