Send Clipboard keystrokes on iOS
The desktop clients can send the clipboard as keystrokes. This would be ideal in the iOS version too, as it is even harder to get a complex server login password right when you can't see them side by side. (I'd suggest ensuring a limit to the number of strokes too, just in case you copy War and Peace by mistake - or perhaps prompt to ask if you really mean to type 65 characters or something)
The ability to copy from iOS clipboard into a remote session via the iOS app is a much needed ability