This seems like a good idea. Another related one occurred to me today
(if it's necessary) which is toggling between the two list indicators.
e.g.
- foo
- bar
- baz |<-- Point
Calling the toggle-list-indicator function at the point will cause the
list indicator to change from a - to a + (and vice versa).
Nice idea! Or even between - and *** at the current level. Maybe
that should cycle. Or maybe there are already existing keybindings
which distinguish between new - and *** entries? M-RET doesn't always
DWIM, personally.