Logisim is really an awesome piece of software, I just have one feature request that would be nice: A virtual keyboard. It would turn key presses by the user into ASCII. This would allow for a way to have something very much like a keyboard and mouse in logisim. The joystick as the mouse and the virtual keyboard as the keyboard. I know that there is a keyboard right now, though you need to go to a bit of effort to make it send the charge, a lot more than just pressing the button.
If you could find the time to implement that it would be great, if not, logisim is still a great logic simulator.
Woops, I worded that incorrectly, what I mean is have multiple inputs eg. the joystick and the keyboard have focus at the same time.