It is classified as an accessory, a list of accessory IDs are included in the documentation. Look for "wrist" not "wristle". Remember, this mod only allows existing accessories to be swapped, not add new ones (you can add new ones by editing the database).
It is the same as FIFA 13, the statement just goes in a different file.
I can not see any errors. Make sure there are no errors in the files where those statements are. Try regenerating. Do you have V1.2 of the mod installed?
No, the download page will tell you the full list of features.