Validation and Form Helper

Just getting used to setting validation rules in CakePHP.

I notice that the form helper will automatically mark a field if it is
set as required.

Is there a way to make the form helper change the size of a input box,
and restrict the number of characters that can be entered, based on
validation rules?

I have this sort of thing in the model

'maxlength' => array(
'rule'=> array('maxlength',30),
'message' => 'Name can only be 30 characters long'
)

But this does not seem to affect the form controls.

Am I asking to much of the form helper?

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