
Plus, it might give cdifan a good list of things he might want to look at.
For me
1. Keyboard Support and Joystick/Gamepad support
Recent Emulator and PC gaming has never been so smooth. After getting an Xbox 360™ Wireless Gaming Receiver for Windows + a x360 controller. It makes me wish that CdiEmu supported gamepads, including support for the analog stick.
2. Save State Support
Of course what good is playing a lengthy game on your cd-i Emulator, if you have to restart to the beginning each time. So this feature is a must.
3. Multi-player Support.
Currently I'm pretty sure only 1 player is supported on CdiEmu. And While a good deal of Cd-i Games are only single player. The Upcoming Frog Feast indeed is a two player game. Of course multiplayer support would only be truly effective with gamepad support.
4. Emulation of the "weirder" Cd-i Peripherals
Mainly the Roller Controller and CD-i Trackball.
Perhaps analog sticks of the newer game pads would be a perfect fit. I know the 360's joystick is pretty accurate.