Just to make sure that we are not duplicating effort here, I have started to work on extending the Unit Test Plugin that JetBrains donated.
Let me know if you are interested in contributing. I will open a sourceforge project shortly.
These are the features I would like to
1) Toggle action instead of 2 actions
2) Confirm test method creation
3) Configurable test package location
4) Configurable multiple test methods names per method under test (testXXX_YYY)
5) On goto test methods -> collapse everything except: setup/teardown/test method
6) Action to go to setup, teardown, fixture
7) Rename of class/method under test should rename test
I will look in wiki for ideas what needs to be supported (http://www.intellij.org/twiki/bin/view/Main/TestPractices)