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I know for widgets you can have properties, but is there a way to trap setting a property in a library?

So for example:
set the foo of stack "bar" to TRUE

If nothing handles the setProp foo, the library code would handle it and do whatever, or would I need to fudge in a backScript/frontScript to pass the setProp to the library?

No, there isn't. You would have to handle the setProp in script and call the library.

Thought as much, but seeing as this is all new, I thought I would ask..

Its an interesting idea though - being able to implement properties in an LCB library for existing objects. This would be a little like 'categories' in obj-c I suppose. However, I'm not sure how wide the utility would be as it only really applies to stacks I guess, where they are backed by an LCB accessible native object (i.e the OS Window).