First, you guys should be very proud. You have delivered an outstanding product. A couple of additional ideas I would personally find helpful.
The ability to see a hand range visualizer for a group of players. For example, I could set a filter for players with n EP RFI of between 10 - 12% and see a hand range visualizer that combines all of the players and provides an overview of the EP RFI hands. Often I am attempting to get an idea for the standard ranges that players with certain statistics have in certain spots and I would find such a tool invaluable in that area. Also, I often don't have enough showdown hands against individual opponents to make the visualizer useful for an individual player (such as in 3B pots).
A summary tab like the one in PT3. I often use that tab to get an overview of the players I have in my database and to identify opponents who are both strong and require further analysis and those that are weak and I should look out for. I'm sure creating such a report in the reports tab would not be too difficult, but it is a great standard report that I found very useful.
Thats it for now and great work guys.