Janab. welcome back to forums after long time.
few months back PW changed the whole interface of this website and initially it become too difficult to do what we want.
i too myself kept watching these forums for many days when they change this whole thing. But after sometimes, slowly everything is OK or let me say that its better than previous version.
Now the thing which you described above is already very well there.
You will see the slide bar on the right side of the thread. Scroll it up/down to your desired numbers of post and you will be there within seconds.
Just give yourself some time get use to this new website of PW.
i can say thats its better than previous one.