Marc and others; Of course I am talking about that you do have synced up with your camera via TC, and fact is that on these certain shoots I will provide a scratch audio hop as well in case of some drift or other error (for the exception!).
And I did post as well before Marc, and these two "syncs", TC and scratch were more then sufficient, to prevent me from any mayor problems at all.
And a doc is the exception, with some exceptions there.
My last two doc shoots really did not allow any slate at all; one was on a shipping vessel on open sea with 25 people we had to follow, just grab what we could get. They where already very aware of us, when the found out that the camera was rolling they start whispering and such. We had to work a bit covert (small cams, plant mics) even. Second one was in a music studio during recording. Same same, very aware of the camera, just quickly grab your moments kind of doc shoot.
Well I didn't even bring his option up, but now you are mentioning it; my last big show I did the post of was a 13 episode documentary series, 5 days of shooting per episode, 4/5 hours of footage a day from a canon 7D. ALL synced perfectly with pluraleyes, because of proper management of the scratch feed. Turnaround per episode was sometimes less than a week to go on air, so even a healthy pressure was there.
As stated in the second post; have some faith in your equipment, to repeat myself: TC sync and scratch audio.