From now on, all accounts can create multiple cron jobs with same URL. For example, you wanna set up some advanced cron jobs like cron job daily, every 15 minutes at 8, 9, 10 AM, you can create 3 cron jobs daily, every 15 minutes, at 8 AM, 9 AM, and 10 AM :)
At the same time, there's only one instance of your URL is executed. For example, you set 2 cron jobs: every 5 minutes and every 10 minutes, so the final result is your URL will be called only one time every 5 minutes. (I'm using SQL SELECT DISTINCT).