I'd also like to suggest adding a selection of fonts. Would it be possible to add support for Google fonts to an upcoming version?
You can already use Google fonts, all you need to do is edit the css file in cms/themes/mytheme/styles/cms.css - If the file doesn't exist in your custom theme directory you can copy it from the default theme directory or you can just edit that one directly which is what it uses by default.
In that css file you can change the fonts, sizes and colours etc. that the cms uses to match your theme better.
If you use a Google font in your design in xara it will be included in the css files that xara exports, then all you have to do is edit the cms.css file to use the Google font names. Just make a copy of the file and you can safely experiment with font changes.