Is there a keyboard shortcut for "Next Topic" and "Previous Topic"?
I would like to flip through Forum Posts without using my mouse,
and without going down to the last comment/reply.
I tried "right-arrow", "left-arrow", with no luck.

So you don't mean the up and down arrows within a thread. You want to progress from this thread to the next? I don't think so.

I'm not aware of any keyboard shortcuts for those functions.
I'm not sure if AutoHotKey could achieve this, as there needs to be a Code handler in place that undertakes the required actions.
Auto Hot Key Link

When I use those PREV/NEXT buttons I just use CTRL+End on the keyboard to make the screen go to the bottom.

You could also contact PG Music or put an item in one of the Wishlist forums to add the PREV/NEXT button to the top of the forum pages.

I would give you a "+1" to that.....

Steve, "to add the PREV/NEXT button to the top of the forum pages." I'll post the wish.

Thanks to all for your replies,
John