Hi, @hgugger! Glad to see someone else from the Carolina's on the forum! I'm in Charlotte.
I set up my fixed schedules for over seeding last year, and last year I ran them with the Flex turned off. This year I was thinking of leaving all the zones that are seeded (which in my case will be my entire lawn) in Flex Daily, as well as running the overseeding fixed schedules. My thinking was that the rest of the grass still might like to get watered deep enough, and that the waterings get factored into the flex daily moisture levels anyway -- it would be a little like getting a small amount of rain 3 times a day.
I'd love to hear what some of the other folks on this forum think about handling it this way.
@robertokc, all I can find about watering and overseeding in the NCSU TurfFiles is "Keep renovated areas moist with light sprinklings several times a day. As the seedlings, plugs, or sprigs grow, continue to decrease the frequency of watering while increasing the duration to promote deep rooting. After the third mowing, water to a depth of 6 inches."
I have my fixed overseeding schedules set up with smart cycle, seasonal shift and climate skip all off, and rain skip and freeze skip on. Smart cycle won't matter one way or the other as the longest amount of time I water is 4 minutes, so it wouldn't function anyway. Freeze skip probably won't matter either, but better to be safe.