Hey Storch,
It's a good question, but the short answer is no on the fuel, and yes on the base damage. It is physically impossible to set a bases fuel to zero. But you can take down FH/BH/VH's to accomplish the same. We can however increase or decrease the amount of damage a field object can take before it's destroyed. We can also control how long it takes to repair it.
We could set the downtimes for hours and hours (days?) - I'm at work and can't look at the setting. Will post after.