I've seen and been involved in games where the DE player goes second. The Raiders then tend to be deployed empty or hidden as best they can. The problem remains that they are vulnerable to most weapons fire from the opposing force. My thought is that maybe Raiders should have the scout special rule attached to them and not the unit they are purchased for. Maybe with a limit of only if they are the second player do they get this rule. This would allow them to move prior to the first turn to receive the cover save for moving fast on the first turn. Maybe a limit to the outflank usage for said unit would be necessary.