Sorry if this has already been requested. I didn't see it anywhere.
I would love to have an option to make all accounts, all global settings, and all upload/download settings blank until you enter the master password. This would just be a checkbox in the Global Settings labled something like 'Hide all settings unless Master Password entered'. Probably the best way for this to work is that under each tab (Accounts, Global Settings, ...) there would just be a blank page saying 'Please enter the Master Password'.
To be of any value, the main passwordfinder.rdf file would have to be encrypted. This would also work very well with the previous request of having a user set time for the master password to be cleared from memory.