Startup in 32bit mode

Hi all, thanks in advance for any advice.
Using Snow Leopard 10.6.3 on a mid 09 MBP. I've changed the com.apple.Boot.plist file to boot into 64bit kernel by default.
One of my programs however uses a 32bit kext. I don't use this program frequently though.
So I want to be able to boot into 32bit kernel when I need to without editing the plist file every time. I read on Apples site and other sites through Google that I should be able to hold down the 3 and 2 keys during startup which will override the plist file and start me up in 32 bit mode. However this does not seem to be working. It's still starting in 64 bit mode when I hold the keys down.
Am I missing something or doing something wrong? Any advice is greatly appreciated.
Thanks

I have an Open Firmware password set. This might also be preventing me from being able to startup in 32bit mode with the 3 and 2 keys. I don't have my Snow Leopard install DVD handy to boot it and remove the password and try again but I will try that when I get home this evening.
You don't need the DVD. Boot with Option pressed and you should be able to enter the firmware password. You should then be able to boot with 3 and 2 pressed. Or try SystemModeConfigurator
<http://www.thrull.com/corner/mac/SystemModeConfigurator/>
to reset to 32-bit boot mode.

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