Whoa, a lot of answer to this tiny issue

At first, thanks for the remarks and comments, I appreciate that!

Helmut
Yes, you have understood me, I'll take your text if you dont mind, thats what I want. (I will also edit it into the first post for new readers):
When navigating pagewise and reaching the top or the end, it might be helpful if one more hit on PageUp would reach the very first thumbnail. (Or very last thumbnail when pressing PageDown). Currently, you cannot reach the very first / very last thumbnail with PageUp/PageDown.
Thats really all about it.

Pic_Viewer, please explain why loosing the row is a problem

And of course you can still use home, Im not suggesting to remove "home" funtionality

Marsh, Im suggesting solutions for small quirks wich are bugging me in my daily workflow.
However, Pg Up is also useful in making selection of large number of images. It would need to be held down some time to choose thousands. And having it accidentally bounce to wrong row (1) might be a problem once it reached the top. It seems awkward to have any multiple function on a single key.
Right, scrolling with PageUp throgh a big list TAKES time. But thats not the issue. If I have a list too long I will just use HOME key. But, there are many many cases where its just very convienent to hold down that PageUp (or Down) key just a few Milliseconds longer to get to the Start or End of the list.
Row issue: XNView doesnt select by rows when using PageUp/Down. (It keeps cursor in the row and selects all files it scrolls over, also files outside cursor row. Fine job, seen worse.) So my suggestion would not doing harm to selections, as selections are not respecting rows anyway.
Instead I think, my suggestion would also improve selecting. It just would select the first one or two items automatically wich it doesnt grab by now.
More, if you *really* want to select individual files, you dont use PageUp/Down anyway. You have to use Cursor keys at the end if you need to refine.
Phhuuu... This is getting complex! Didnt imagined that! I hope I made myself clear.
PS:
"It seems awkward to have multiple functions on the same key".
I agree in principe. But its not a bad thing by definition, it depends on the case. And we are discussing the case here, so the result should in my eyes be dependent on the outcome of the discussion of the case.