The following line is duplicated in the install() method and one of them needs to go:
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Express Checkout: Automatic Account Creation', 'MODULE_PAYMENT_PAYPAL_DP_NEW_ACCT_NOTIFY', 'Yes', 'If a visitor is not an existing customer, an account is created for them. Would you like make it a permanent account and send them an email containing their login information?', '6', '18', 'tep_cfg_select_option(array(\'Yes\', \'No\'), ', now())");
That has been there since 0.9 (released 27 Feb 2007). I'll delete it.