I don't think that the character used is in itself that important here.
I'm all for dash/minus for single-level lists, for example.

-- [[Radomir Dopieralski]], 2007-Mar-08

"Space required only after a second-level bullet list item" doesn't correspond
to what's implied in [[BoldAndListsAmbiguity]]. That's what I'd implemented
first before failing the test cases, getting ashamed :-) and changing my engine...

A space is also required between stars used for lists and stars used
for bold. But I think it's the most obvious thing to do for authors, and it's easy
to specify it.

-- [[YvesPiguet]], 2007-Mar-08

Ah yes, I did phrase that incorrectly.  Fixing it now...

-- [[Chuck Smith]], 2007-Mar-08