After the modules now only show their own types in the recent documents (bug 159120), we should make sure that a decent number of docs will be shown in the recent document list in each module. For that, we should make sure that each module shows as many recent documents as is configured (currently 25). At the moment, the whole list is 25 documents, and the module filter will reduce that list. Also, the start center should show all documents from all modules. This will increase the number of documents displayed in the start center.
The expectation is likely to use the PickListSize value. In other words, whether showing items from all modules or only the current one, the maximum length of the MRU menu must not exceed the PickListSize. The start center should IMO show all documents.