The SSH remote terminal component also has its own custom keyboard as seen in this screenshot. Diet Coda works with Bluetooth wireless keyboards, too. If you use one (see the first slide), the entire screen area is available for editing or terminal use. Note that Diet Coda is not limited for remote work with UNIX and Linux servers. Apple's Mac OS X includes an SSH server for remote access. And, there are free Open Source SSH servers that can be used with Microsoft Windows Server, too. freeSSHd is the one I use with Microsoft Windows. It has improved quite a bit since I first used it back in 2008. This could allow you to, for example, work with Microsoft PowerShell from your iPad.