Dancemat support for Stencyl???

Hello! I am currently studying game design for college and for my latest assignment, I wanted to try and add dancemat support for the rhythm game I am making. (See file for what I mean).

I was hoping that if this is possible, someone here could help me with implementing this into my game (or even if it's possible in the first place).

Yes, it’s possible — a dance mat is usually treated as a USB game controller or keyboard depending on the model.
Stencyl is not designed for deep hardware/gamepad support, but you can try plugging it in and press the arrows to see what keys it maps to. In Stencyl, use when [key] is pressed events, just like normal keyboard inputs.