Hold down Ctrl (control) when you want to move the cursor and not type a letter. If you want to type a letter (eg, s) and you move inputs, just move back afterwards. This only becomes a chore when typing in a multiplayer lobby, otherwise, it should cover the essential stuff for you
@Teddy, maybe a good idea to mention this somewhere? Perhaps when rebinding any of the move keys, it brings up a little pop up?