On MacOS, you can use the vim mode of Karabiner. This lets you hit and hold "s" and "d" at the same time and then use h, j, k, and l as the arrow keys. Sadly I

On MacOS, you can use the vim mode of Karabiner. This lets you hit and hold "s" and "d" at the same time and then use h, j, k, and l as the arrow keys. Sadly I haven't found equivelents for Windows or Linux.