The FEED function could have place there depending if you're dosing into your sump instead of main tank. If pumps are off during FEED cycle you'd be dumping your full amount of stuff into your sump that depending on the length of the FEED cycle might not be a good idea. With that said, you'd also end up missing a dosing if the FEED cycle was going when doser was supposed to be.
Fail safes only work if you have some way to monitor what you're doing. For example when people dose Co2, the pH is affected by it, so people monitor the pH to see what the Co2 is doing, if pH levels go below where they want, the dosing of Co2 can be disabled at that time, and alert sent out.
For vodka dosing since I just googled what it does quickly, The Apex doesn't have a probe that would be able to monitor anything the vodka would change so you wouldn't be able to put in a fail safe as you wouldn't be able to tell if anything is wrong due to the vodka dosing. The only thing you could setup as a fail safe is that if other things are going wrong in the tank stop the dosing, but honestly stopping the dosing based on other things going wrong, could be a recipe for disaster as it could just compound the problem
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