My experience is similar to Ishanahan's above, and is unlikely to change in the near future, for a number of reasons. But it is nice to know I am...

Yes, effectively. You are correct, we cannot control the actual visibility of the parameter based on the selection in a previous one, but being able to change the source...

Thanks for your response - I'll give this a go.

Thanks - a very helpful link.

I'm using the suggestion of adding an extra column and toggling the visibility based on my parameters - each column is set to the width...