Just to add some ground to the Galagast’s claim about upcoming PFTools: Box#2 – inspired by the script setup, I did a simple test with Box#2 functiona…

Not possible – the Express edition does not have tools for creating a GUI for a plug-in. Thanks, Oleg B.

This approach may have some problems during rendering. At render time you are not allowed to generate new objects – it is asking for a crash to happen…