This is something that we plan to add to the certificates feature, but at this time there is still no ETA for when it will be added.
leoricci, GlennD is the one person at GoTo whom I trust the most. The best and most up-to-date answers are here on the discussion boards.
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@leoricci I wish I could provide you with more news but after talking to the Product Manager that is all I have currently. We have a 'product roadmap' of features and improvements planned for GoToWebinar and enhancing the Certificate feature is on there. Once there is more specific news about this feature, myself or AshC will update this post.
And, in addition to those needs, we also need to be able to send the certificate only to those who attend for a specified amount of time. The certificate has to say how long the webinar was. The certificates are absolutely useless in terms of compliance with any regulating body. So webinars presented for professional development and must be counted toward hours required by some sort of authority can't use the certificates. It was a good idea to add the certificates, but the execution is lacking because you didn't listen to the actual users of your product.