[thierryyyyyyy]

I also have a idea why *every* user put tags space separated.

I my theme, there is a sentence just before the tag text field that tells users to put spaces …:

<label for="tags-input"><?php printf(__('Enter a few words (called <a href="%s">tags</a>) separated by spaces to help someone find your topic:'), get_tag_page_link()) ?>

And I think that in the original kakumei…

and my translation (in french) also ask user for space separated tags.

to, you can have a “social” bug-fix of this problem : change the cited line in your theme (file = post-form.php). That “social engineering” !