delete_old_comments filter for interval?

As the amount of spam on my blog is getting more important (20K spam comments in the db is too much for my tiny vps-server, “empty spam” times out), I would like to purge spam on a more regular basis.

I checked the Aksimet source code and saw that the function delete_old_comments_meta (in akismet/class.akismet.php) does have a filter to override the 15 days “retention” policy, but delete_old_comments does not (it has the amount of days hardcoded in the prepared statement).

My questions:

• Is there a specific reason why only delete_old_comments_meta has such a filter?
• Can a similar filter be added for delete_old_comments in one of the next updates?

thanks,
frank

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