Need function to look up existing custom field object

(As discussed in the list)

I have a need to look up an existing custom field, and automatically update the option values with crm_create_option_value($params, $customField) and a similar crm_delete_option_value($params, $customField) that doesn't yet exist.

Ideal is if the params for this new crm_get_custom_field( ) can be in the form of array('name' => 'edid') if I wanted to look up a custom field that I had named 'edid'.