Yes, after you bake your project you can change the fields types. Navigate to the folder where all your views are located, for example: app\View\MyViewName. Baking is a great tool to get something up and running fast. If you have a fairly structured website mostly used for data entry this is a great tool. I used it for simple data entry websites and it has saved me so much typing! Just add some data validation/constraints in the model and you're good to go!
A freshly baked view will look a little something like this:
<div class="MyForm Form">
<?php echo $this->Form->create('MyForm'); ?>
<fieldset>
<legend><?php echo __('Add My Form'); ?></legend>
<?php
echo $this->Form->input('field1');
echo $this->Form->input('field2');
?>
</fieldset>
<?php echo $this->Form->end(__('Submit')); ?>
</div>
<div class="actions">
<h3><?php echo __('Actions'); ?></h3>
<ul>
<li><?php echo $this->Html->link(__('List My Forms'), array('action' => 'index')); ?></li>
</ul>
</div>
Change the input methods to look something like this:
$options = array('Y' => 'Yes', 'N' => 'No');
echo $this->Form->radio('myFields', $options);