As per the current Bootstrap docs, disabled radio and checkboxes should also have the disabled class added to their surrounding label tag, so the labels will appear to be disabled instead of clickable.
See: http://getbootstrap.com/css/#forms-controls
What is generated now:
<div class="radio"><label for="settings_pricing_method_1"><input type="radio" value="1" name="settings[pricing_method]" id="settings_pricing_method_1" disabled="disabled"> Use OEM Pricing (where available)</label></div>
What should be generated:
(The only change is in the very first div tag)
<div class="radio disabled">...</div>