Questions on the threat model: -Is the computer turned off or on? -Do you want to a) protect your computer from being stolen? b) protect your weird fetish from being discovered? c) protect your online banking credentials?
Answers on the threat model: - Yes the computer is turned on - C is the main worry, with regards to A, if somebody has managed to get into the house and is about to take the laptop, there is absolutely nothing I can do about it so I don't really worry about it. And as for B, I have absolutely no weird fetishes at all and have done absolutely nothing wrong EVER :-)
I think another password manager you only log into when no carer is around could be the solution, that has all the sensitive passwords. If there are any files you want to protect you could put them in a truecrypt container.