The issue with the Sudden scoring system is that you get 0 points if you're not an M. (i.e you can't get to 500). All you need to do is figure out how to make that not true. As for an infinite mode, I wasn't aware Texmaster could even do that. But Sudden Ti 0 is indefinitely survivable by most people who play Ti, and I'm sure Sudden 0 is indefinitely survivable by most people who play Tap. Who do you want to appeal to?