requiring arg(3) in form submit handler breaks programmatically submitted forms

in user_relationships_type_edit_submit, you have code like this:

function user_relationships_type_edit_submit($form_id, &$form_values) {
  if (arg(3) == 'add') {

This effectively makes it impossible to programmatically submit this form because it is designed to only work if submitted from the form's page itself. Since creating relationship types is not an event that will happen often, you can afford to insert the row, check the number of rows affected, and if it is zero, update the row. Alternatively you could delete the row and then insert it, like is done with variable_set: http://api.drupal.org/api/function/variable_set/5