What would be much better, would be if other operations - such as search and bracket match - that move the cursor vertically did the same thing, at least if the cursor would end up very close to the top/bottom of the page.

Ideally this would be a nice enhancement to NP++, but if anyone knows how to combine an existing NP++/Scintilla command with some extra plugin code (e.g. how to invoke the search dialog from within the plugin, retaining control after the search has been performed) that would be interesting.