From what I know (correction would be appreciated), '又什么...' is often used in rhetorical questions, for example:
Then what about '又没什么...'?
Does the '没' word make it have the opposite meaning?
又什么麻烦/ is a wrong expression. The correct one is 有什么麻烦, which could be either a rhetorical or a generic question. The normal expression is 又有什么... and in some cases 有 can be omitted, but you should be careful. In your example, 又有什么不满意 and 又有什么麻烦， 有 should not be omitted.
Well, in 又没(有)什么麻烦, 又 is more like the English word anyway in my opinion. So, 又没(有)什么麻烦 could be interpreted as there isn't any trouble, anyways.
Compare 又没有什么麻烦 and 又有什么麻烦. The latter is a rhetorical device as you said. The former is a normal negative sentence. Both denote the same underlying meaning, but with a bit different tones, which are the same as the correspondent English sentences.
An interesting phrase I also want to add here is 又什么事，which is short for 又有什么事. In this context, 有 can be omitted. So, I suggest you add 有 all the time unless you know for sure it's right to drop it in your context.
As it stands, it's most likely a mistype (misconversion by IME) of "有什么麻烦" and "有什么不满意". When used in proper context and tone, they can be meant to be rhetorical questions, otherwise, they are merely questions.
If you believe this is not a mistype, specifying which dialect (or where in China you seen these being used) we're talking about would be greatly helpful. I am born and raised in Beijing, in case you're wondering whether I'm capable to make such a judgment.
