This mod is pretty hard to use with spoilage - if an item spoils in an inserter's hand before being inserted, it's just hung and has to be manually cleared. A belt loader has a similar problem. Once items are in the chest, if they spoil they are easy enough to deal with, but this situations prevents any "fool-proof" method I can think of for getting items safely into the chest - you pretty much have to make sure everything is fresh - which is difficult when you can't measure freshness on a per-item basis, you can only tell things to prefer the "fresher" items.

How about having the chest accept the item and it's spoiled version if the item spoils? Then all you have to do is clean the chest out and the problem is solved. The chest can clearly already deal with spoiled items inside of it, so this seems like it should be fairly easy.