5110cn and Adobe Reader 7.0 can't pull from multiple trays?

I have a PDF that has page 1 of paper size Legal and page 2 of paper size Letter.

In the print preview, everything looks great. I am using Choose Paper Source by PDF Page Size and in the preview it shows page 1 as being 8.5x14. Page 2 shows up as 8.5x11. Perfect. BUT, when I go to print the 5110cn only pulls from Tray 1 which is Letter.. for both pages. If I pick Advanced->Print as image ... THEN it pulls from MPF (Manual Feed) for the Legal page and Tray 1 for Letter page 2.

Of course my final document will be 300 pages long with changing paper sizes all throughout. As far as I know, "Print as image" seems to bomb if the print job is too big. So, this is NOT AN OPTION.

My printer settings are:
Firmware Version 200612011020 (Released 2/21/2007)
Network Firmware Version 8.41 (Released 2/21/2007)
Printer Driver on my WinXP machine (Released 7/25/2006)
... these are all the latest drivers.

Is something wrong with the PS drivers for 5110cn??

Please help...thanks,
Darrell

P.S. This is an expensive printer and I'm surprised this bug is there. :(