It would be nice if IDEA supported a few things we need to do often/regularly (that do not seem too hard to implement.)
1. I would like IDEA to auto generate non-static class & interface wrapper for all static methods in a class. We often need to wrap static helper code so it can be interfaced/mocked.
2. I would like IDEA to auto generate a factory class and interface for any specified class. We often need to create factories so we can test constructors.
3. I would like IDEA to auto generate the unit test class for a class. I want it to auto create all the mocks for all items passed into the constructor. This one might be harder to implement as I'm sure everyone has a slightly different way to code this. This feature might needs lots of customization so it works for all users.