Dedicated CKEditor button for inserting code snippets

We're creating a wiki where a lot of code snippets need to be included in pages. There is a macro for inserting code, but we don't want (our human) editors to be able to see and use all macros, just the code macro. I tried installing the CKEditor codesnippet plugin (http://ckeditor.com/addon/codesnippet) but it does not seem to be compatible with XWiki upon experimentation.

A quick fix would be if anyone could tell me how to only show certain macros depending on what group you are in the wiki (couldn't find after googling).