Juri Linkov <juri@jurta.org> writes:

> 2. Add a new defcustom like:
>    (defcustom minibuffer-defaults '((highlight-regexp-default . tag-at-point)
>                                     (rgrep . history)
>                                     (occur . tag-at-point)
>                                     (how-many . history)
>                                     ...))
>    Cons: Too large list of commands for one option.

I am attaching a patch that handles `occur'.  I will commit this patch
tomorrow.

ps: I have never used how-many. The defaults for grep and rgrep never
bothered me.  So I leave these two commands out of my current scope.