custom error message per field

I'll have a look into this for the 2.x branch

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Moving this as a possible feature for the D7 branch.

No patch to work on, setting to Active.

Yes,
You should try Webform Validation module along with IFE.
Webform validation module allows you to set validation rules by selecting fields. While setting fields you can set custom error message.
Webform validation also allows few hooks like:
hook_webform_validator_alter(&$validators).
hook_webform_validation_validators().
hook_webform_validation_validate().
hook_webform_validation($type, $op, $data)

Try visiting Adding custom validation rules - Webform Validation hooks
IFE is module used to show submission errors inline with the form elements.

I hope that helps you.

There is also: String Overrides module or Field validation where you can specify a validation rule per field with 'Custom error message'.

Closing as this feature is already provided in modules mentioned above, and this module is rather for moving the messages only as far as I understand.