I agree, FG's animated dice rolls are very cool. If you could hear the dice roll, it would be perfect.
The dice in Battlegrounds are photographs of real dice, not 3D renders. Battlegrounds, since it's created in Adobe Director, could theoretically support realtime 3D rendering and even do some physics simulation (using Havok) to make the dice roll and bounce realistically. Unfortunately the limiting factor in this case is not the authoring environment but my programming knowledge. Perhaps I will get around to adding this in v2.
On the other hand, there's also something to be said for BRPG's ability to handle sophisticated dice mechanics with absolutely no scripting involved. For example, rolling 5d6 and 1d8, dropping the lowest die automatically, sorting the remaining dice, counting anything above a 4 as a success, and looking up the result on a chart. That's something you can't really do if you're limited to just dragging and dropping virtual dice to roll them.