Limitations on Number of Notes DBs Indexed by Google Desktop

I installed Google Desktop Enterprise 5.9.1005.12335-en-pb on Win7 Pro 64-bit. It appears I can only add 13 additional local Notes databases (in addition to names.nsf and my mail file) - the Add button is grayed out once a total of 15 Notes DBs have been added.

Is it possible to increase this limit?

thanks, Norbert