Um, yeah, I guess. For the quest script, put my Quest script above the SMR and then follow the directions here:
http://rmrk.net/index.php/topic,33381.msg404078.html#msg404078It's just because my quest script adds itself to the menu, which conflicts with how SMR sets up the menu.
For Scene_whatever, all you need to do is find out what calls the script - normally that information will be in the instructions of the script wherever you got it from. Whenever you see something in the instructions that says: $scene = Scene_XYZ, Scene_XYZ is the name you need to put into Yanfly's script.
Generally, it will be something related to what the scene does, so for instance, the scene class for my Quest Journal is called Scene_Quest.
Most scripts will preface the name of their scene with Scene_, so if you can't find it in the instructions, just press CTRL+F and input Scene_ in to the find field. Then click next until you find a line that says:
class Scene_XYZ
Scene_XYZ is what you're looking for. If you link me to any of the scripts you want to use, I could tell you what the scene names are.