[Therion] The goal with joining scraps

Hi folks, some questions about the join command. We join scraps to make nice pdf-maps or other two-dimensional maps like svg, xhtml and kml. Of course, this is a very good reason. 1. But are there other reasons to do it? For instance, do joins have any influence on other exports, like the maps (walls) in aven or the models in loch? I did a simple preliminary test, and couldn't find any difference whether the scraps were joined or not. 2. Do you always joins the scraps? Are there some situations when its not necessary, or even wrong, to join scraps? Torstein Finnesand Norway