How to prevent the display of date settings and the details of who has voted/can vote

There are various ways to do this. Some permissions are available to view all votes, and the date stuff can probably be themed away. I'm not sure we want options to show all those settings, my take on it is that it's the job of the theme or a third party module.

Of course if the starting/closing dates are disabled, they should not be showed, but that's a different issue, imo.