First of all, congratulations, great tool, and the fastest I've tested!
Now, it would be great to have a column detailing the local and AD groups that have read/write access to each share folder. As an example, a very primitive tool such as sysinternals' ShareEnum does something like this (see [technet.microsoft.com])
Update: preliminary support for shared folder security scan has been implemented. A test build is available here. The Enable security & user permission scan option must be enabled in the network scanner's options under the Shares tab. There will be one rightmost column added, which can then be dragged to a suitable position. Currently the network scanner is only capable of showing Everyone's permissions on a shared folder. We appreciate any suggestions, comments or bug reports.