I'm also not sure what excactly is the problem - it's definitely fiddly to adjust the columns - but maybe a table-chart could be a more flexible alternative: Building a nicer, dynamic QlikView multibox The Qlik Fix!
well, building a multibox for user_selections is not exactly what I want to do, but it surely is an interesting thing that I'll try to keep in mind.
Well, I guess your definition that "it is fiddly" pretty much sums it up. If there isn't any particular trick to it - I'll just make do with that.
What I'm currently working on is not an app that is going to be viewed by users, so it doesn't necessarily have to be nice and elegant.
Thanks a lot!