Here is my first contribution to the Kicad.
It is a Replicate layout action plugin, which replicates arrayed sheets.
I tried running @mmccoo script , but could not get it working as pcbnew python API changed since then. So I rolled my own version, which is more procedurally oriented, as my coding skills are mainly in C. It can be used as an Action plugin or standalone. It also includes some basic testing in case the API changes again.
Any comments are welcome but bear in mind that my response time might be long.