I understand that these parts copy Vostok and Voskhod pods, but outside historical recreations they are very strange to play with. There is no reason why you would use Pea instead of mk1 capsule. Its decoupler and heatshield don't give any significant advantage over small and controllable mk1. Same with Onion compared to mk2. Pomegranate is quite light for 3-seat pod, so it is useful for 3-crew landers. It's decoupler and heatshield are useless for this application though.
My idea is to include ejection mechanism for Pea, just like Vostoks had. It will make the part more historical and at the same time more useful and interesting to play with. Other pods shouldn't feature this ejection mechanism, as their historical counterparts didn't. This will make Pea somewhat unique.
Onion should probably have more distinctive mounting for airlock module. It can also have solid motors for softer touchdown, which in reality were introduced on Voskhods for the first time.
While Voskhod 1 with 3-crew was a great achievement, I don't think that it is a very interesting mission to recreate. Thats why my idea is to completely redesign Pomegranate and make it resemble Soyuz pod instead. It will add more posibilities for historical mission recreations as well as alternate history N-1 moon landings and modern missions to ISS. With some lifting surface, solid motors for touchdown and iconic look in general, it will be a great pod to use.
All in all, I can see that many people ask for changes in these pods and their properties. Now it just looks like laziness, three different parts with almost the same look and the only difference is the amount of Kerbals inside. Come on, Squad, it was a paid DLC, while we bought it to support you in the first place, we expect some visible updates in it too.