I'd like the ability to perform a "mercy release" of a balloon. I just caught a balloon that was entirely written in Japanese, with replies entirely in Japanese. Unfortunately I don't speak Japanese, but I had to write a response in order to send it along. It'd be nice if we could have the option to release the balloon without any note, but still have it tagged that it was caught and released by me (for the original sender). I felt bad writing "Greetings from Canada" before sending it off.
Maybe adding a language option would also work - "only catch balloons written in these languages" with the ability to check some boxes.