You'd probably have to use an array, i'd help more but arrays are the most confusing thing in the world to me.

are you saying that you want to be able to later update the game with new items, and that you need a scrolling menu that will allow so that you can come in and edit later?

You can make it to where you have the event player on collision with another object and then create a sub event where the player is falling onto something. then you can add the action to it to destroy or do whatever you wanted

No, i think you might have to just settle for global variables, i mean if they work than i don't think they'd put in a third option. check the manual, it would be in there if there was a third method to variables.

i just tried what you were talking about and yeah it might be that you're reseting literally everything in that layout including the order, I use the reset persisted object command in the system menu like newt said.

can you explain this in further detail, because is it your z order, your layout order, or your layer order. the z order just makes it so that in one layer you can change which items are on the top and on the bottom, so lets say i had 2 objects on the same layer and obj 1 goes behind obj 2, in the z order i can change it so that obj 2 goes behind obj 1, but if they are on separate layers than which ever layer is on top will always be on top. i'd need to see an example of what you're talking about.