Custom Validation Rule & allowEmpty

This is a (multiple allowed):

I need to have my custom validation rules determine whether or not a field should be required or not. This is currently impossible as:

if you set allowEmpty the custom validation rule will not fire if the field is left empty
if you set your custom validation rule, the field is forced to be required before the custom validation rules will trigger.

When I create a custom validation rule, it should run it's logic and return true/false whether or not the field is left empty or not.

When a custom validation rule is in place, a field cannot be left blank and forces data before the custom validation rules execute.

Provide feedback