I agree that different settlement systems can have different settlement logics. And I am also aligned with filler experience improvement.
As I understand, ResolvedCrossChainOrder which is the response of resolve and resolveFor functions should contain the terms of settlement for filler to know how he can successfully fulfil this intent.
There is no room for settlement specific metadata in that struct right now. If we add the additional settlement specific metadata the struct would change and no longer adhere to the standard, isn’t it?