Created attachment 4719 [details]
Screenshot of the proposed revised interface
If the DisplayClearScreenButton preference is turned on, show a nicely-styled link instead of the standard button.
Tested on Windows 7 in Chrome 12, Firefox 5, Safari 5, and IE 8.
Created attachment 4720 [details] [review]
CSS and HTML change, pushed
Experience of deploying this change to production servers has shown that many librarians are shocked and dismayed by the sudden change. I would recommend avoiding backporting this patch to 3.4.x, and instead saving it for 3.6, as it seems to require a small level of retraining. I defer, however, to the Release Maintainer's judgement.
ian comment +1 (and anyway, it's noted as an ENH, so should not be in 3.4.x)