I would really love to see the ability to register your public PGP key with a device. Then every device could have their own public PGP key setup for each person participating in the share. Then you could encrypt the files with everyones public keys so only they could open it before sending it. That way everyone would know the files are completely secure on each others machines. This would make it better for businesses. For example my brother is a lawyer and it would make it much easier for him if it auto PGP encrypted the files as he put them in his sync folder. Knowing they would be secure no matter what device they end up on, whether it be his phone or computer or coleague.
