Control report properties via report parameters. Add expression functionality for each report property variable.
Most interested in being able to control via report parameter the Height of the report canvas.

For example
Have a report with A3 layout (Width 42m, Height 29.7cm). Would be nice to give clients the ability to extend the Height when viewing. When a report is printed (hopefully never) we want to use the standard paper sizings of A4, A3 etc but for when grouped data for an entity (ie project) extends beyond one page (ie multiple years with large variable text columns) would be good to give the user the ability to extend the Height value to control page formatting across logical pages when viewing.