sorry, for the late answer, but now you can find a new version of the simulator at http://www.peerfact.org
Regarding to your questions:
1. several groups in the same location are now possible with the tags “id” (identifier) and “groupId” (location).
2. You can define the size in the ResourceSet (compare existing configurations for the filesharing2 application)
3. The filesharing application simulates filesharing with stores and lookups, I do not know what you mean with “the comlete filesharing method”.
4. The successful lookup or store is notified by the analyzers.
Furthermore, there will be an extension to the existing filesharing application in the next release which makes handling more easy.