i have made anew cb plugin that will hide username filed in both registration and edit profile pages and set username to be = useremail without any hacks to original cb files or tables and you can switch this function on / off any time as any other cb plugin
works with all joomla and cb versions
deatils and demo here www.joomlaaa.com/Our-Products/joomla-community-builder-email-as-username-plugin.html
thanks for your question but this plugin will make username = email while user make his registration as many people ask me for something like this as users some times forget their username but they always can remember they email
I see, you mean email only during registration process. I thought you were talking about the possibility of logging in with email instead of username. With reg. process I don't know if it is possible.
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