The fix is available on the Shapespark hosting.
To change the arrows turn speed, place a file called body-end.html
in your scene folder with a following content:
<script>
(function() {
// How much per second the camera turns with right/left arrow keys.
// (the default is Math.PI / 2).
WALK.CAMERA_ARROWS_TURN_SPEED = Math.PI / 10;
}());
</script>
This code changes a global constant that controls the arrows turn speed (by default the arrows turn by PI/2 radians per second).
Until the next desktop application release is available you need to upload the scene to test the effect.