I'm not sure this fits your use case, but I'm after some of these.
Use Cases:
1. Compiling into a custom web server directory, then there is no need for the code server
2. Compiling the app
3. Removing the current GWT Compiler dialog
4. More flexible compiler classpath
5. Future WTP publisher compiler integration
What I'm really after is a more flexible persistent compiler configuration I can call over and over. Such as:
Compiler -incremental -setProperty user.agent=safari -war /path/to/war
Does that help?