I don't think anyone wants it. I wrote it attempting to address a need @jdemeyer brought up, but it apparently makes things worse for him, not better. I don't think we can just set a Python signal handler and leave it, because a Python signal handler won't break out of compiled code which the user may have called.

Jeroen has implemented the machinery in Cysignals to restore OS-level signal handlers from Python, but we don't want a compiled dependency in IPython. And there doesn't seem to be much interest in getting that functionality into the Python signal module - though there isn't antipathy either, so maybe if someone made a pull request it might go somewhere.

Closing this for now, anyway.