I think the rules can always be made clearer. I'm not sure more rules are better. I think, in many kinds of situations in the private and public sectors, we find not so much that there weren't enough rules, but that people either didn't know how to apply the rules, or the culture of a particular organization encouraged not following the rules. It's not so much that you need more rules.
That being said, I've already signalled that I think the Conflict of Interest Act deserves some attention and some tuning up. That might involve more rules, but it looks to me like there's nothing in the current case that couldn't be dealt with under the rules as they are.