My understanding is you want to handle calls to the module (class) for routes (functions) that might not exist? That right?
codon itself might not have anything, but PHP has __call?
public function __call($name, $args) {
// ...
}
where $name is the first regular variable of your route: index.php/module/var/...
and $args is an array containing all the rest: index.php/module/var/arg/arg/...
This isn't so much remapping as handling calls to functions that don't exist, so if you visit index.php/module/action and function Module::action() exists, it will only call that function, not __call.