I’ve tried to attach an usb keyboard at home and, even if typing text is obviously faster, a lot (the most) of things need to be done touching the screen. It would be nice to have some external keyboard shortcuts (predefined or even better user defined), using for example combination of shift, alt, ctrl and function keys, to fast access documentation, “play”, color picker, texture picker, select one of the suggested code completition item, ecc.
Unfortunately iOS does not allow us to detect modifier keys on the keyboard. Otherwise we would be keen to put these features in.
There must be some workaround, because I know for example that iSSH is capable of passing modifier keys through to the remote machine.