I read this thread yesterday and decided to try out Missed Reminder.
I have it set for:
Start/Stop Service on
Autostart on
Notification Icon on (the Red (!) circle on the notification bar)
Missed Calls only (I never send text messages, why type, you have a PHONE!

Popup off
Vibrate off
Ringtone vector
Blink led off (don't need it because the HTC missed notification will blink the trackball light. If you want the led to blink, you can select any color, but it will always blink Green)
Notification intervals 5m
Number of repeats forever
When you first turn on the phone, it will sleep normally. But, after you get your first missed alert, it then stays awake until you task close the program or restart your phone. You can stop/start the service, but it still stays awake. If you task close the program, that closes the program and turns the service off and you won't get any new alerts. But, you can turn the service back on, the phone goes back to awake and it functions again when you get your next missed call. You can view your Notification bar and select either the HTC missed call notice (1 step, because that will automatically clear the Missed Reminder Red (!) circle or you can select the Missed Reminder Red (!) and then view your missed calls (2 steps). Either way will reset the Missed Reminder Red (!) alert. However, from that point on, after you get your first alert, the phone stays awake all the time. However, it's been 12 hours since I turned off the wifi and mobile network and went to bed until now. I just let the phone sit all night and until now, no playing with the phone during that 12 hours, and the battery has only dropped from 84% to 76%. So, it doesn't look like awake time automatically means huge battery drain. Awake 16:49:30 99% Battery=76% This is the only progam I have installed that seems to keep the phone awake all night.
However, I'm not concerned about 99% awake time anymore.
Since I've double checked this while typing this up, the phone is at Awake 17:34:09 99% Battery=73%
I think it's easier to just leave the phone awake instead of playing with killing and restarting the service.