Allow smartlist as coverlist

[lolli78]

It would be nice to have the smartlist "all open tasks" on the cover.

[Armadill0]

To be honest I don't get the point where this could be useful. I think most users have multiple lists with from a few to very much tasks inside. If you would be able to display the "all open tasks" smart list on the cover, you would only see 7 tasks from dozens which are in those lists.
As you can not directly control which tasks are being displayed because all lists are being merged into this one large, I don't see the benefit to implement that.

Anything I'm missing?