Custom validation (callback) for blank field value

[eluser]Dan Dar3[/eluser]
Thanks drewbee,

that confirms my finding, just wondering if there are any plans to change this behaviour?
Or maybe somehow allow for custom messages for each 'required' rule, I think there is a thread on that already out there. "The %s field is required." message is not very helpful to the casual web users or any message that is mentioning the field name.

Thanks,
Dan