What are Xephyr's current shortcomings?

[Yitzhak B. G. <yit...@ya...>]

Thank you for bringing Xephyr to our attention. It was
not entirely clear what the current shortcomings of
Xephyr are.
Assuming we don't care about speed, can we safely
assume it won't crash? When you say limited input
device suppor, what does that mean? Our needs are
plain and simple: PC compatible KB with few or no
function keys. LEDs are not essential for us. Two
button optic wheel mouse. That's all.
Yitzhak