I asked about this, and there is good news for you:
"would it be possible to just ignore the sensors on boards/chains with problems?"
I think this feature request would be to disable sensors per board (chain) instead of the whole miner.
that's implemented for the upcoming release
That is very good news indeed! Thanks for asking!
There is nothing you can do when you are powering up a fan you get full power to it, until the controller boots and orders it to slow down. The only way to solve this would be with a hardware solution, such as feeding 7v instead of 12v for 1min or such...
Ah, I see. So it's not a setting, but fans getting the full 12v until the controller kicks in.
Well, maybe I will just disable the fans altogether and look for an other way of cooling. In my case noise is the biggest issue.