In general, if you have a trade edition of a book that includes a forward by another author, it is not unheard of to ask the author of the forward sign the book as well as the author themselves.

But what about a S/L? If you had the chance would you have the author of the forward sign later as well? Would you try to fit it on the Limitations Page, or somewhere else? Or would it just not be appropriate, possibly even lowering the value of the S/L?
Thanks!