Here are some of the suggestions that I think should be available in future platforms;
* support for native functions from javaME
* As cell phones are used BIG time out there for new media research and development, developers should be able to disable any keys on the phone they want not just the whole key pad
*Camera API should be able to take better shots with javaME. Right now it only takes thumbnail size photos.
* You should be able to specify in the jar file about the permission domain the application falls in so that the developer will not have to change suite settings every time after installing an application.