The module responsible for emailing doesn't support this currently, however, it is the example module (mystuff) who's source is included with the Keypad app. It'd be pretty easy to modify it to include the zone number in the email. The zone number should be in m_Message.Numeric. Just make your changes and recompile it with Mono and you should be good to go.
User ID is a little more difficult. In order to get that you either have to have an LRR device connected to your system, or set up your AlarmDecoder to emulate one by toggling a flag in the config. After that you'll start receiving !LRR messages. It looks like Sean already wrote in a skeleton function to handle LRR messages in the example module, so you'd just need to write some logic to handle it. You can find the reference for LRR messages here:
http://www.alarmdecoder.com/wiki/index.php/Protocol#LRRThanks,
Scott