Setting for same-width-embeds (2.9)

The new auto-embed feature of WordPress 2.9 is great! I have only two requests to make it perfect:

• Some way of setting a common width that all embedded videos will be set to (height should be set accordingly so the aspect ratio stays correct).
• A check box for centering all the auto-embedded videos.

The way it works now works great, but I think embedded videos look a lot better when they are the same width as the text column and/or centered. And if embedding several videos on a single page, they look a lot better if they have the same width. In my opinion anyways ??