If you merge an autocad file into a wysiwyg file you can choose which layers to import and which to leave out. I would like to see that option as well for merging two wyg files. Also, there is an option to ignore shortcuts while merging and similar to that I would like to see an option to ignore scenes too. I always end up with duplicate scenes now since I work from a template file. This means that the target file and the source file have the same scenes.