Picking up this old thread, since I just got my Pebble smart watch.
To me, it would be very useful if you could add a Tasker e-mail event plugin or whatever is needed. With email title, sender, content, etc. The Pebble ecosystem has no knowledge of your very fine AquaMail, so the only way to get AquaMail email notification to the Pebble is to get Tasker to monitor for notifications from AqualMail. Unfortunatelyg, the Android system only allows Tasker to read the title of a notification, not the content, according to what I've read. So when I get a new email, my Pebble (through Tasker and a Pebble notification plugin) only tells me that I have "28 unread messages in Smart Folder". Nothing about the new email I just got. It would be very nice if I could get information about the latest email(s) on my Pebbble, without having to switch to another email app.
[Insert standard disclaimer about my appreciation of AquaMail, and that I would not replace it with any other email app, even if this feature is not added.]