There are a few operations that drive me a bit mad one is that I can´t select like 10 clouds at a time and set them visible/invisible, or set them all at a tim RGB or Scalar.
For the visibility part is much needed and I think should be straightforward.
For properties I understand different clouds may have different properties, still I think could allow to modify the ones that are the same on all.
multiple selected edit
Re: multiple selected edit
Well, you have the 'toggle' shortcuts ('s' for scalar fields, 'c' for colors, and 'v' for visibility)
Daniel, CloudCompare admin