I've penalised a team for being late on the field. At the PMB I told the captains that KO was 1430, they would get a 10, 5 and 2 minute warning. Black went into the sheds at around 5 minutes, then got a two minute warning, when I called the coach (who was in the sub area) who sent some one over and it still took around 5 minutes for them to come out, all while Red and I were waiting. Time on, PK Red for Poor Sportsmanship and time wasting. No issues from either coach nor my assessors and I'll do it again in the future if I need.
Respect is important in the game and if you turn up late you are disrespecting the other team.