Google recently launched the ability for third parties to integrate directly into Google Calendar using Google Marketplace apps. Apps added in this way add themselves natively to the "add conferencing" option and it's very slick and professional, as well as browser neutral. This would be a substantially better and native approach than the current Google Scheduler plugin that unfortunately often breaks and whose implementation feels a bit hacky.
I'm guessing Lifesize is already following these developments. I would be curious on what Lifesize's thoughts on this are.