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I don't see anything in them that would make me think it is a bad idea to create a layout dedicated to stocking objects.
Stocking objects is not bad when you are still editing and it is the first instance per object that you are putting there and this should only be temporary because this is only used to make construct 2 familiar with the size, opacity and other properties of your object / sprite and later on you will have to move it to the layout that is going to need it afterwards. And this is only applicable for games with many layouts. And every optimization freaks out there that is concerned with code optimization knows that you shouldn't leave something in your program that is not going to be needed. So if you think about it, if you want to have a more optimized game then you should delete that object layout on export.
"NOTE: When a game leaves the layout. It releases images from memory that is not going to be needed in the next layout to make space for the new images for the next layout. This is necessary for optimization of games. Think about it, if you don't flush it for the next layout and keeps adding more images. Sooner or later it's gonna overload and crash or have fps spike and etc."
If you think I am wrong, please correct me. Btw, I did not made this statement based on my observation only, I made a lot of test on this before just to prove this and this is also based on my experience. I had a game before that became so slow because of misunderstanding how ram memory works and by not reading the manual. And I learned my mistakes the hard way.
Rable