Thanks for your help! I didn't know this needed Powerpack, but I just bought and activated my license. I imported that workflow and it works half of the time. However, sometimes the jump key for forward or backward switches randomly. Like if I'd try to activate the back key, it might jump forward, but then the next time I try it, it'll jump back.
Also, is there a way to use the hotkeys without shifting the app focus to MPlayerX? I was testing it out and whenever I start typing in Adobe, then jump backwards, the app switches to MPlayerX.
Thanks again!