I would like to add a vote for that feature. In addition, or, maybe, more specifically, when adding songs to a set list, I'd like the option to be able to choose songs from a specific Smart List (so, for example, if I am looking to add Irish songs to a particular set list, I would like to be able to easily choose from among the songs I tagged as Irish, and that appear in my Irish Songs Smart List, rather than having to exit, go check my Smart list, and then go back to editing the Set List).
Thanks!