From BlenderWiki

Possibly Maybe Todo List

Here are some things that's I'd like to look into for the BGE. Now, I'm not making any promises, and I don't know if/when I'd be able to do some of these things. However, I'd still like to look into them. Also, these are in no particular order.

• Key combinations with the keyboard and joystick sensors
• Proper GUI support (ie, no more textured planes for menus)
• Force feedback support for joysticks that support it
• A way to protect .blend files (either encryption or possibly pre-converted bge files)
• Replace the MT library with Eigen2 in the BGE for better math optimization.