Better SPAM protection
On public instances it might be important to care about who can access to our mail address. For example bot can get tooltip(on repo owner) content where we have email address.
Here is a fragment of our home page:
<div class=\"rc-user tooltip\" title=\"RhodeCode Admin &lt;firstname.lastname@example.org&gt;\">\n
On redmine we can choose to hide our mail address as user, it could be a good solution. Using reCAPTCHA might also be nice since we would allow humans to contact us.