>> >  Multiple > Search >
>> >    Query Replace Using TAGS Table...   M-q
>> >    Query Replace Using `find'...       Q
>>
>> dired-do-find-regexp-and-replace could be left bound to Q, but
>> dired-do-query-replace-regexp could be bound to M-% in Dired.
>
> For the latter, I use `M-q' (not `M-%').
> I suggest that vanilla Emacs do the same.
>
> These two commands have quite similar purposes.
> I suggest that they have similar keys.
>
> Also, `M-%' has its normal meaning when Dired
> has been toggled to writable (WDired).  That
> key should be kept for its normal purpose, IMO.

'M-q' has its normal meaning of filling the paragraph,
so it would be confusing to use other meaning in Dired.

While finding a good short key would be nice, here is a patch
that for consistency with 'M-s a M-C-s' also adds 'M-s a M-C-%':