Reopening last session instead of creating a new one, when several startup pages enabled

I'm having several pages to be opened on every startup in chrome and I'm having the "Remember open tabs between browser sessions" option enabled in sidewise. When some of the startup-pages match the last session's pages, sidewise considers it to be the same session, re-opens the saved one and hibernates the ones that don't belong to the startup-pages and adds the startup-pages that weren't part of the last session.

I'd like it to still always keep the last session closed and only opening the standard startup pages. (In fact I'd love to be able to set folders in sidewise always being opened on startup and others being hibernated but displayed in every new session's tree. But I guess I'm gonna post that in an extra Idea-entry...)