As of now, by default the wiki love message is placed on User Talk page even if we click the wiki love icon from User Page. But in most wikis (at least in Malayalam Wikipedia) the barnstars are usually placed on User Pages. So there should be an option to place the message directly on User page apart from the current User Talk page.
That is, if we click the WikiLove icon from User page the message should be placed on User Page. Same way if we click the Wiki Love icon from User Talk page then the message should be placed on User Talk page.