Adding text under select items that are not automatically made into a check box?

I'm not clear what you mean by "not have it automatically add a check box to it". You mean you want to have a list of items where one or more of the items isn't checkable?

Something like this?

My checkboxes:
[  ] Option 1
[  ] Option 2
Option 3?

As some options, you can enter text in the description field, or make a markup component and place it below the radio buttons.

Unfortunately this isn't an option within Webform. It's not directly supported by Drupal itself, you have to manually theme radio buttons if you want to accomplish what you've requested. For Webform it's an even bigger problem in that there's no place to even put a description for each option.

To accomplish what you want, the only option is to do the custom theming yourself. You can read THEMING.txt to learn how to theme individual Webforms. In the webform-form-[nid].tpl.php file, before you print out anything (I think) you can add a description directly to each radio option.

$form['submitted']['radio_buttons']['option1']['#description'] = 'Description for item 1';
$form['submitted']['radio_buttons']['option2']['#description'] = 'Description for item 2';

But I haven't tried this myself. You might need to be even more manual and render out the individual pieces of the radio buttons.

Update after a little research. No this will not work immediately. Because theme_radio() does not support the #description attribute. However, it would still work if you also over ride theme_radio and check for a #description attribute and print it out if it exists.

Closing after lack of activity.