Comment #3 on issue 654 by tu...@tudorgirba.com: [Glamour] Undocumented differences between types of actions http://code.google.com/p/moose-technology/issues/detail?id=654
It means that ideally, this mechanism should be replaced by some nicer API. Basically, now you have to instantiate the GLMAction in the block and manually create a list. I do not particularly like that :). So, I thought that we should warn people that this might change.