There are settings that I apply in IDEA, that the plugin cannot generate. Hence, the next time I generate new project files, these settings are overridden. One example is the new facets feature in Selena, which adds support for JPA, Spring and Hibernate. The idea maven plugin cannot generate these settings in the project files.
So, why are JetBrains not actively contributing, to keep the plugin usable and up-to-date? It would make their IDE easy (easier) to use on maven projects. Just like they are now doing with the new maven integration in upcoming IDEA7.