Re: delete-selection-mode

    > Here's a possible idea: enable
delete-selection-mode by default
    > but only after shift-selection and
mouse-selection.
    >   

    A useful "quasi-quantization" to consider is
how many bits of state
    a user must keep in mind to accurately predict the
dynamically variable
    behavior of self-insert-command.

It's not a real factor for this issue, because the two
cases
are quite distinct already.