It would be a great way to sneak in cool stuff like:

'extend the ezimage operator to add support for custom vhosts (recommended eg. by yslow for the best user-experience" without having to recode the complete site replacing ezimage() calls with ezextimage()'

How to do it:

• add a new ini setting: template operator -> php class (eg. in template.ini)
• declare deprecated (but not remove support yet for) eztemplateautoload.php file
• when loading the list of registered tpl operators, load eztemplateautoload 1st and the new ini settings 2nd (the 2nd one taking precedence)
• remove existing eztemplateautoload.php from kernel/commonf and move it to std ini settings