Go to Settings | Customize | Keys and create new hotkeys which run:
Set Sortby=Name SortReverse=Off
and
Set Sortby=MODIFIED SortReverse=Off
When creating the keys make sure you turn off the System-Wide Hotkey checkbox to avoid taking over those hotkeys in other programs.
Edit: You can do this with this add-in now:
Since the viewer window is detached from the lister window that launched it, I can imagine that feature could, at times, be annoying Opus. (i.e. Moving through a viewer might change your file selection in a lister you've been using for other things.)
Having said that, maybe, on balance, it'd be useful more often than annoying. Something for debate, I guess.
Anyway, there are a few alternatives that exist already in Opus. Maybe one of them works for you:
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If your aim is to open the file in Photoshop you can drag the viewer window's icon (top-left of the window) on to Photoshop. This has the same effect as dragging the file to Photoshop.
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Pressing Ctrl-T in the viewer will "tag" the image in the lister which launched the viewer. This doesn't select it but rather adds a column of checkboxes to the lister ("Checkbox Mode"). I think there's a command for then selecting the checked/tagged files, although I never use this so don't know it off the top of my head. Either way, it makes it easy to find the image you settled on.
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You could use the Viewer Pane instead of a standalone viewer window. The pane opens as part of the lister window and always displays the currently selected file. If you move to another file using the pane's arrows then the selection also updates. You can move between files using the arrow keys, or bind hotkeys to the Select NEXT and Select PREV commands. (One thing to note, though, is that some non-image files, like PDF and Office documents, will take the focus which can be an annoyance when navigating via the keyboard. If you're only looking through images or using the little arrows above the viewer pane then this isn't an issue.)
All the best and welcome to the forum!