Glad to hear you are enjoying the new Html 5 features on TTV. :)
In the near future we will be making more improvments to TTV. One of the items we are discussing is an updated home page so you can look forward to that. We currently do not have any plans to add comments for videos, all feedback can be sent through the feedback form, which is read by the guys working on TTV. I will look into the tooltip issue right away.