Yorba crowdfunding Geary development

I like mutt too and use it all the time, but the one thing I really miss (and had back in 1996 on my riscos box) is the ability to look at several mails at once and cut and paste between them to synthesise a response from several inputs. This is incredibly useful and I used to write better mails in the 1990s because of it than I do now. Mutt can have one mail (and one mailbox) at a time open, and one has (so far as I know) to do an awkward dance with postponing the current mail, finding another relevent one, saving it to scratch space, re-opening the original mail then importing the new one to take bits from. This is very inefficient. I have started to use screen/tmux with several mutt instances to see more than one thing at a time, but this wastes memory and you still can't actually see them both at once. Perhaps I am just missing some much better way of doing this?