Why can’t I assign a person to be a judge and a steward?

It doesn’t really make sense based on the point award schedule. If a person judges in one or two sessions in day, they receive one judging experience point. If a person stewards in one or two sessions in a day, they would receive one half non-judging experience point. So if a person stewarded in one session and judged in another, half their judging experience points would be replaced by non-judging experience points. Since judging experience points are more valuable and are harder to obtain, it doesn’t really make sense to record this role.