IIRC there are a few keys that cannot be changed. Arrow keys may be among those.
In that case you either need to change the source code and recompile, or resort to using for example autohotkey (Windows) or xmodmap (Linux) to temporary rebind keys.
Edit: I took a look into the code, and indeed the arrow keys as directional keys is implemented in the src/video/*_v.cpp files. Search for "_dirkeys =" in the source code.
Patch: configurable hotkeys
Moderator: OpenTTD Developers
Re: Patch: configurable hotkeys
My OpenTTD contributions (AIs, Game Scripts, patches, OpenTTD Auto Updater, and some sprites)
Junctioneer (a traffic intersection simulator)
Junctioneer (a traffic intersection simulator)
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