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The laggy scrolling is likely because they're not using native scrolling, but rather using the same JS based scrolling they use in the web app to overcome issues with iOS 4's support for fixed CSS positioning. However, since the toolbar is native in the app, they should just use native scrolling.

You can get send as if you use Google Sync (gmail over exchange instead of imap) and enable the send as setting in their control panel. You can also do it over IMAP by copying and pasting a comma into the account field and adding another email address, I think. You may also have to use the SMTP server with alternate credentials.

also multiple google accounts signed in at once would be nice (and would allow me to stop using mail.app)