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SUMMARY
It'd be nice if numpad mouse navigation would let you move diagonally by holding two cardinal directions (e.g. down+right / 2+6), like you would expect on a 4-way d-pad, in addition to the 1/3/7/9 diagonals.

STEPS TO REPRODUCE
1. Turn on mouse navigation with numpad.
2. Hold 2+6 (down+right).

OBSERVED RESULT
The cursor moves in whatever direction you hit first (effectively random if you hit both at once).

EXPECTED RESULT
The cursor moves diagonally in both directions held.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian 12
(available in About System)
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
We're using mouse keys on a wireless keyboard for lack of a convenient mouse/trackpad, and don't have any issues with our fingers. I don't know if this is intentional behavior to prevent messing up if you press multiple keys accidentally. My guess is probably that just nobody thought of it, but just in case.