On the 1000 you can Pan so I rather presume that you can on later models
You never know with Garmin, I'd rather have confirmation! Also how easy is it to zoom in and out of the map? If on the map screen view, do the +/- buttons default to this functionality or do you have to go through menus?
If you want this functionality, the 520+ might not be the best choice.
The 520+ and the 820 might be a bit slow for heavy navigation use.
For complex navigation on the fly I'd whip out my phone and plan a route in Komoot or similar and send it to the device, I don't want a large device like the 1030 on my bars.