Exchange push works, but other accounts won't push or fetch

Question

On the 3GS, there is a setting for "Fetch new data" on the main e-mail settings screen. The individual accounts (I have gmail, yahoo, aol, Exchange and Hotmail) don't have a setting for this.
I have set this to "Push" and for the most part, that works for the Exchange account and Yahoo account. However, the Gmail and other accounts stay put until I open their Inbox or refresh all accounts from the Accounts screen. There isn't any way to even set up a timed fetch for these accounts.
Is this a known limitation? Any workarounds until Apple fixes this (or allows an account-by-account setting for mail delivery method)?
Aloke

Answer 1

There is a global Push setting for the iPhone - for email accounts that support push access, and for 3rd party apps that provide push notifications.
For an email account that supports push access, there is also a setting for the account to disable push access with the account. When disabling push access with an account that supports push access, the global fetch setting will be used, or should be.
There is not a separate fetch setting by each email account account. There is a global fetch setting for all accounts. For all email accounts that don't support push access, and for a push account with push access disabled for the account, the fetch setting should check each email account for new messages based on the time setting chosen for automatically checking for new messages.