Hi, I'm a bit new to speedrunning this game, but I didn't see in the rules whether or not a controller/gamepad is allowed. I use a PS2 controller just because I happen to have one and a USB connecter for it, but I don't see anything in the rules specifying if I have to use the keyboard or a controller (controllers are much easier for me.) I just wanted to clarify this before I submit any runs.

I'm pretty sure that'd be fine, since you can enter in a run from console, which gives you no choice but to use controller. I don't see any huge advantage using controller to the point where it'd be unfair, so I would just submit

Using a controller is allowed, because it doesn't give you an advantage over any other input method.