The numbers 1, 2, 3 are already used on the keypad for the zoom and there are still numbers left for possible perspectives.
For example:
2, 4, 6, 8 for the cardinal points
1, 3, 7, 9 for different zoom factors
5 for a reset to default zoom and south-north-view
This way, you could quickly switch perspectives, next to zoom factors, without messing much with the mouse if there is need for orientation.
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