I guess so, but it is a bit limiting. There are already several researches just for flyers.
Flyers and:so why research it if you are never going to choose it because it has zerosum (or thereablouts) benefits?
Yesto pebs - care to suggest some figures for illustration?
to figgee, so the ships would have to make 2 trips?
When they are picked up do they also carry the plunder multiple home?
What happens to the units in the meantime, eg do they defend the city they just plundered in the case of another attacker hitting, or maybe they get slaughtered if native troops return or other troops are sent in support (the realistic option) or something else?
Would the transports automatically return for them as soon as they reach port and drop the others?
Can you send other empty ships to collect them while their original ships are still sailing home?
This does seem a bit longwinded and convoluted when you could just send the right number when choosing the plunder option.