I have seen a few fits thrown in my day and usually think these are drama queenerie.
This is all I ask and again I think it boils down to basic courtesy:
1. If you accept things for review, give it a look immediately and decide if you are, or are not, interested in reviewing it.
2. If you decide you are, put it in a stack (or folder) and review things in the order you receive them.
3. If not, just let me know.
That's it, and I really think it's an easy and fair thing I'm asking.
I've had many, many reviewers tell me, sight unseen "I don't like system X, so I don't review for it".
This, to me, is a perfectly acceptable stance and I have never been annoyed by that response a single time.