I understand your concerns, especially regarding battery life. Not trying to judge here but do you really have more than three important email accounts that require constant monitoring. I had as many as 5 accounts on my device at one point but since deleted 2 to clear space on my Start screen. If some accounts only drop an occasional message would it not be ok to check them less often, like when you have other reasons to unlock you device. Its like Marketplace. No notification on the lock screen, but its not like I must have that update, even though some times I am waiting for one in particular. I may be way off base but figured I would throw it out there anyway.
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