edited for 2.5

Making a Field Read-Only

If you want to change a field to be read-only, you currently need to use JavaScript to do so. The following filter and function will help you accomplish this.

gform_field_settings_tab_content

The gform_field_settings_tab_content action hook is used to echo the content for a custom field settings tab in the form editor.

Accessibility Checklist for Gravity Forms

This article takes you through settings and options for forms and fields to help educate you as to what (and what not) to use for better accessibility of your forms.

gform_block_form_forms

The gform_block_form_forms filter allows the list of available forms displayed in the Form block to be overridden.

gform_required_legend

The gform_required_legend filter enables the legend displayed at the bottom of the form header, which explains how required fields are indicated, to be overridden.