Here was my blurb on my own suggestion: I use the chat archive several times per day on my mobile device. Having to scroll to the bottom each time is ridiculous. Having the newest chat entries at the top would be a much better situation for people who might reference the chat archive several times per day. Here is why I use it. My group has had to make a concession to play the current game I am running. We can't have live games often enough so we use the chat in between live sessions to "play by forum" or in this case, play by chat. This works very well for us. It keeps the players engaged in the adventure until the next live session and we can get a small amount accomplished or do RP stuff in between the live action scenes. Because of this, I find myself logging in to Roll20 on my phone several times per day to check the chat archive to see if anyone has made any new PbF posts in the past few hours. I don't want to wipe out the archive to make it smaller either because we have had to reference it on a few occasions. This seems like a small/easy change that would make a big difference for me. I have to believe other people will/do use Roll20 in a PbF manner, so it might benefit those other people as well.
