If there are many people in chat, it happens, from time to time, that some of the messages we write are not shown. Since we are not allowed to copy/paste text, those messages are lost. This can be very frustrating, especially for long messages.
I suggest to implement a feature to cycle through our previous messages (and next, off course) with up/down keys, exactly as it is possible in Linux/Windows terminal windows.
In this way, we could just repeat what has been lost.