I don't know anything about Schedule::Cron but you could do something like this ...

$ crontab -l
5 5 * * * touch cron_ran_`date| tr ' :' '_'`
10 10 * * * doSomethingOrOther
$ crontab -l | grep -v touch | crontab
$ crontab -l
10 10 * * * doSomethingOrOther
[download]

If you need cron to remove the job itself just set up your crontab like this ...

5 5 * * * touch cron_ran_`date| tr ' :' '_'` && crontab -l | grep -v t
+ouch | crontab
10 10 * * * doSomethingOrOther
[download]