Keeping track of the rounds was something that came up in every battle during my lastest campaign, for exactly the reason Tom stated, duration of effects. Our Gm was far too busy (keeping track of rolls, players, enemies, story & dialogue interaction, and helping newer players understand what to do) to keep a round counter going. Even if they had, the encounters likely would have suffered for yet another demand on the gm's attentions. Individuals can keep track for themselves, of course, but even that becomes complicated if an encounter spans across multiple weeks, or all players aren't on the same page. While there are work arounds, I hope this suggested feature doesn't get completely dismissed. While I am not sure what the difficulty with adding a general round counter is, perhaps an alternative could be to add another number next to each player/enemy on the turn roster to indicate how many times they have reached the top of the list, if that would be simpler to add?