leo26,
changing the existing courts : not before a very long time. I guess I'll release one so you can see how it's done.
Adding a court : technically, in terms of Modding, it's super easy, with the exception of the description script (it's used to tell where are the speed & time boards and stuff like that). I'll have to remove its tie to the rest of the engine, so it'll be a bit more complicated. But basically, if you create a Stadium in Unity, you can export it in an Asset Bundle and the game will be able to load it. I guess I could set up the script stuff within 1 year, when I'll work on Modding requests.
HotWingsFTW,
click on the Ball icon on the left of the replay bar. You can also save camera settings within the Camera menu and then restore them with the Camera icons.
Mattipulation,
assign 1 button per strike ; an example here :
topic15-29252.php .