Keep launcher in memory is an option in spare parts which comes with the rom
I have had "keep launcher in memory" checked for some time and it doesn't appear to be enforced. If you do anything memory intensive, exit to the home screen and click on the launcher, it's fairly common for it to be blank, close launcher, wait 30 - 60 secs, re-launch and all of the apps are displayed in the launcher.
For the record, I did not have this issue with BB 0.1. I assume it's appsToSD related, so I moved everything to internal memory, no improvement in launcher behavior.