1, What about support for nonblocking wait(). It would be very nice not to block the main thread if you really don't care about waiting for the sub process but just want to be nice and not create zombies.
2, What about nonblocking read/writes or support for timing out reads/writes at least. On linux you can select() on the file descriptor but that is not supported on windows.
I believe that support for nonblocking operation is important since spawning external processes is a common way to parallelize work and std.concurrency could take advantage of this as well.
/Jonas
