I think you can achieve the first by changing the OpenOffice style of the bibliography. For the second, it's possible to set the spacing with an option in the bibliography section of the CSL style, "entry-spacing" (it specifies the number of lines between entries). For an example, check out http://www.zotero.org/styles/chicago-author-date
Thanks. I didn't realise that it worked that way. I thought click 'refresh' would change the formatting back to how it was originally (body text style).
Edit: It seems I will need to employ both methods, since Zotero has put an empty line between each reference (bad practise since this is better controlled by changing paragraph spacing).
Edit: It seems I will need to employ both methods, since Zotero has put an empty line between each reference (bad practise since this is better controlled by changing paragraph spacing).