I installed the ROM from a few weeks ago and had the opposite issue - when setting up a gmail account, the setup wizard auto-set the protocol to POP3 and I wanted to use IMAP4. I'm guessing this issue happens on any email extension the wizard recognizes.
I got around this by entering a slightly broken email address in the very first wizard screen - e.g.
my.emali@gmai.com (it can probably be any domain name, really, as long as it doesn't match a recognized provider). It didn't recognize gmai.com and took me to the page asking if it should try to get email settings automatically. Uncheck this, and you'll be able to specify the protocol type in one of the later screens. After you finish setting up the account, you can go back and fix the email address to have a proper extension.
Hope this helps...