It would be great to have a parameter to set exceptions from the default cache
live time, and force regeneration after a set time. For a site most images are
static and never needs to be regenerated. But some images are fetched from
external sites and need regeneration more often. If I could set a image to
regenerate every 3-hour with parameter regeneratetime="180" (minutes), it would
alow for more dynamc use of the module.