Hey, all. Just sharing this for the sake of completeness.
The problem I was having w/ OneShot.cgi and WebKit.cgi wasn't a
configuration problem at all, just a quirk in OS X, as covered here:
Upshot: don't start Apache through CLI, let OS X do it on boot (restart).
So, Webware/WebKit installation on OS X is essentially identical to that
for RH/SuSE Linux. This holds for the CGI handlers, as well as mod_webkit.
Getting the AppServer to start on boot? Heh... good luck w/ that, I'm
sure not having any.