1 Snapping Fences so they line up nicely with each other does work, but only just. The gaps between the fences vary more than can be explained by rounding errors; roll up fences will not snap closely to the position of fixed fences or other roll up fences, and will jump consistently many millimetres and misbehave when trying to position them in a neat row or column.
2 When scaling icons with ctrl-wheel the behaviour is inconsistent - sometimes it changes only the icons in a fence, sometimes several fences but not all, and I have not quite worked out what is does for portals. Some strange combination, I think. Probably should be done by fence.
3 ICON SELECTION is pants. Selecting a few icons in a fence sometimes end up selecting a portion of the whole desktop area which can cause iconic chaos and loss of composure. Selection rules and means both need attention.
4 The ability to select a set of fences and move them to a different desktop would be useful.