Both categories of Tetris Friends can be found on Flashpoint and Notris, which is an unofficial Tetris Friends client. Flashpoint's TF only allows the lowest DAS and ARR while Notris allows all customization in TF.

Are either of these good for the leaderboard?

edit: have since found that flashpoint is allowed as the most recent run is done on it, that just leaves Notris

I just tested Notris, and it seems to work exactly the same. The basics at least. So, it's good for the leaderboard yep :p . That's good news !