I find it very annoying when a person has several near identical trees open, if for instance mr Smith has 4 near same trees then I get 4 matches because of this, it takes my time to accept or reject these matches. Why not ask the submitter which tree to use for smart matching (Usually the latest one submitted). and only match using that tree.
Also, it is sometimes difficult to say match or no match, why not have an "unsure" button?
Ingrid, Yes I have already used the "ignore this tree option", one member seems to have completely copied my tree, you can tell by little nicknames that you use which also get copied over, I don't mind but he didn't even ask. so he now gets ignored.