I'm pretty sure that's left over from the base TGE game where you play as an orc in a medieval setting, you leave foot prints and dust comes out with each step
Those never happened in Blockland though, even back in v0002, so those mechanics must have been removed early on in development
Also, you can actually access the emitter datablocks by typing 'LightPuffEmitter.dump();' into the console to view the datablock and other commands that can be used with it, or you can type 'LightPuffEmitter.save("Add-Ons/Folder_Name/fileName.cs");' into the console to save the datablock to your Add-Ons folder so that you can view and edit it