Add JIT options to preferences

From the [original project](https://github.com/cebix/macemu)'s [`BasiliskII/src/MacOSX/ToDo.html`](https://github.com/cebix/macemu/blob/0a7fe2eaf8e88a458836c3ec1f382906b253d85a/BasiliskII/src/MacOSX/ToDo.html):

> Add JIT options to preferences?

No further information is available; it's also possible that this issue has been addressed in the time since that 2007-07-14 revision.
