You know when delay is 0 the message will be sent next dailymail. I believe you are asking if there is a way to see when "Cron-style Followups" are due to be sent - is that right? Currently this is not possible and it would take a fair custom script to achieve it. You can find the code in the dailymail.php file...
include('./cron.php');
$cr = new cron;
$now = date("Ymd",time());
while(list($mid,$cron)=mysql_fetch_row($result5)){
if($cron){
$cr->calcLastRan("* * ".$cron);
$due = date("Ymd",$cr->getLastRanUnix()-1);
if($now == $due){
$sendids[] = $mid;
if($DEBUG) echo " Delay is 0 and cron is due on the new message - sending!<br>";
}
}
If you know PHP you could create a script to look ahead a number of days and run the cron test for each followup... This could further be cross-referenced with users, but it is definitely a non-trivial job!
Regards