Updating URL table Alias lists with either a cron entry or an API call?

[JustMeHere]

Can we do Cron style updates for URL Tables in Aliases? The idea is that I'd like to update the list every 6 hours with a random 15 minutes...then have the URL Tables refresh on the 16th minute.  Or even better, is there a way to trigger an update via API call?

[pfry]

I'm missing how this is different from the refresh interval. Or are you just looking to vary the timing a bit? (Boredom?)