Gadget has a nice feature on its piano roll where the bars are touchable, in other words by touching on the third bar the pianoroll focuses only on the third bar. By swiping over one or more bars you expand the zoom settings. What's more, below this you can set loop markers per pattern. I think this is a very enjoyable way of editing sequences. Modstep also has a similar, arguably better, approach. Then there's Ableton that allows you to adjust the zoom by dragging over the pattern overview window. Perhaps that's what we'll expect in a later release? In terms of the vertical zoom I don't think it's even necessary. One optimal zoom setting should be set and fixed. This is why I prefer the gadget or caustic piano roll over the Cubasis one.