You might want to try out MessagEase, which is a flick syle keyboard like the Japanese ones mentioned above. There's room for a lot of punctuation on the same

You might want to try out MessagEase, which is a flick syle keyboard like the Japanese ones mentioned above. There's room for a lot of punctuation on the same layer as the alphabet, plus support for ctrl/alt/F-keys. I find it great for working with ssh.