Unless they've updated the integrations, only first name, last name, and email can/should be pushed with the integrations as support confirmed. As Josh said, I'm not really sure why you'd need this information in Webex.
One limitation that we have found with this, is that we are unable to get survey results, or questions/comments during the webinar into Marketo which would have been nice to have. We can do it manually, but a sync would obviously be preferred.