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+- serial.write() may block for reasons beyond our control.  For
+  example, CDC-ACM devices may do flow control internally and block on
+  USB transfers; the CDC-ACM interface does not expose flow control
+  settings to the PC, and writes will hang indefinitely even if
+  --flow is not used.  Since polling the keyboard is in the write loop,
+  this kills us.
+
+- Support some other escape character so ^C can be optionally used.
+  Maybe even remove ^C as an option, use ^] exclusively?
+
+- Support reconnection
+
+- See patches from "Guyzmo"