You can update the token with john@example.net;doe@example.net in token list.

For adding : input type="email" : then only one email.
The HTML5 system can use multiple="multiple" to allox multiple email. But then it must be separated by , : and actual system use ;.

I think of diferent solution, and think this one is OK:

• use input type="email" multiple="multiple"
• update all email function to explode by ";" AND "," when searching for a multiple email.

Quick solution is to remove the input type="email" and use type="text", but HTML5 is really great for user.