Just to let you know. OS4 native csh runs. Well, sort of. I didn't expect the executeable to run because I have still things to do. But nonetheless, I just started it...and, voila, it really runs. It crashes after a command execution (simply stops after a GrimReaper/Ignore), but the command executed properly ;)

To be honest, I would have expected a fatal crash, but it didn't. Cool.