I've done exactly that and I receive a crash whenever I select the command. But yes, that's what I'm looking to do, create a menu option that takes the function of Page Down primarily. I'm not too concerned about going both ways. The problem is that by adding this menu command (which I've gotten to work on Yanfly's Equip plugin and Scene_Skill) is that your script is expecting the command to open a window. I could probably manage to make it go to Parameters Page with the next actor in the party, but as I've mentioned I'm still learning JS here and there.