On slot machines and smiilar, have a running profit/loss indicator much like in Blackjack/poker. Where it shows, based on a zero null value when opening the game first, how far pos/negative you've gone over the session, without needing to do an excel sheet or something. I don't know why this isn't just a standard feature across all games. I know it's a good tactic for real casinos (easy for people to lose track of their losses and keep going) but seems a weird omission from a game, especially since it's inconsistent. I just want a quick way to see how well a spin set is doing without having to keep track of my starting dosh.