User defined key maps in visual modes

[Rot127]

Is your feature request related to a problem? Please describe.

I tend to default to my editor key shortcuts when in visual mode.
Because everything looks so similar. This means I press a few times the wrong keys before changing to the correct key combination.

Describe the solution you'd like

I'd like to redefine the keys in visual mode. So it is more similar to my editor setup.
E.g. I'd like to scroll pages with Ctrl-d/Ctrl-u instead of J/K.

Describe alternatives you've considered

None, this is a pretty standard feature nowadays.

Additional context

Isn't urgent, and should be done with the TUI update.