Styles Editor
A styles editor similar to the one that currently exists for EndNote so that an bibliography/citation style is very easy/rapid to design and implement without needing to write an XLST document.
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http://forums.zotero.org/discussion/1091/what-i-would-like-more-than-more-output-styles
http://forums.zotero.org/discussion/647/adapting-bibliographic-styles/#Item_2
and what links from these.
For micha, I would send in a bug report if you see missing details like you note. The goal of CSL is to get away from users having to modify styles altogether, and to benefit from the distributed possibilities of the internet.
Of course, that doesn't obviate the need for an easy-to-use editing interface so that users can help build up this publicly available stock of styles.