This is a real quick, real small suggestion that I hope can be implemented easily. Just like objects have the property LayerName and LayerNumber - to determine to which layer they belong (very useful in picking) - I'd like to request a similar LayoutName property.
This particular request stems from the fact that I'm currently working on a game which has a large number of layouts (one for each screen in a first-person adventure game) which all share a common event sheet. Some of these screens will have common objects that behave differently depending on where they are. While I can create a variable called Parent or something and manually assign it to every instance of the object (what I'm currently doing), it'd be far easier if I could simply pick them by which layout they're in.