Smarty-Email policies are not consistently enforced

Based on this wiki page, administrators may opt-in to Smarty-based email templating using define('CIVICRM_MAIL_SMARTY', ...):

http://wiki.civicrm.org/confluence/display/CRMDOC40/Smarty+in+mail+templates

This policy is enforced by CRM_Activity_BAO_Activity::sendEmail(...) and CRM_Mailing_BAO_Mailing::compose(...). However, there are some discrepancies in how its enforced by CRM_Core_BAO_MessageTemplates::sendReminder(...) and CRM_Core_BAO_ScheduleReminders::sendReminder(...):

1. The sendReminder(...) functions always evaluate with Smarty, regardless of whether CIVICRM_MAIL_SMARTY is specified.
2. The sendReminder(...) functions never enable $escapeSmarty when filtering the message body with CRM_Utils_Token::replaceHookTokens(...).
3. The sendReminder(...) functions never enable $escapeSmarty when filtering the message subject with CRM_Utils_Token::replace*Tokens(...).
4. CRM_Mailing_BAO_Mailing::compose(...) updates $smarty->security before and after evaluating templates; none of the others do the same.