Would be nice if cron.d and user crontabs (/var/spool/cron/crontabs) were
delegated by /etc/crontab instead of being hardcoded in cron daemon. I.e.,
like /etc/cron.{daily,hourly,monthly}.
This way, proper integration with anacron could be done in /etc/crontab, much
like it is done for /etc/cron.{daily,hourly,monthly}:
25 6 * * * root test -x /usr/sbin/anacron || run-parts --report /etc/cron.daily
This would allow for anacron to handle cron.d and user crontabs without having
to hardcode them in the code of anacron as well.