I wasn't able to replicate the "Session Cookie" behaviour from Konqueror.

I want to allow certain sites to store cookies permanently (just like now with the "Cookie Filtering" whitelist) while accepting all other cookies but throwing them away after closing the window. When I select "Delete cookies on close", my wanted cookies (like from bugs.kde.org) also get thrown away. While "Allow storing of cookies" without deleting them will let everything into my cookie jar.

So a possiblity to whitelist certain sites (cookies granularity would even be more awesome, but ... well ;-) ) and accepting but throwing away at the end cookies from all other sites would be quite helpful.