You build the sidewalks inside the gallery templates (the schematic files). Then you configure how big they are in the configuration file.
I don't use a Schematic

but he complains about worldedit bugs... Would be cool if I get eg the Plains section (or village) from the gallery server and can adapt that

Need to limit to how many areas player can claim. How can i do this?
Sorry, there's no way to do that yet.
May I ask where to download this? There is no link in the thread :o