Finally found this thread to explain how the scrollbar works XD was looking in the projects forum first, as I didn't realise it'd been added here as well. Now it make more sense. I think.
First/Previous … Next/Last … would be easier to understand.
And the drop-down list can be located between the First & Previous links, because the contents of the list are between those two posts (so that's the logical place for it to go)