If they agreed with suggested topics/ posts, and want to send merits to qualifying ones, they have to unignore those boards. In fact, it is a easy step, but it's just a small adjustment, and if theymos can do that easily and with very little time, why not?
For example, if theymos pointed out a good post, and you clearly know that nearly whichever post theymos made, he usually receive bunches of merits. Then, after seeing theymos posts, you decide to visit original posts of others [actually in you Ignore board] that quoted by theymos, and find out that you can not send your merits to those posts if you don't unignore the board.