Here are some things I have problems everyday that I think Intellij could help me with:
-I would like to be able to open files outside my project definition. I do this to avoid using an other app; and sometimes because I need to merge code from a locations outside the project. With all the indexing overhead it is not convenient to temporarily add a dir to the project/module.
-I would like to scan a whole project for unused classes. I often generate a lot of classes as i develop and have to spend much time getting rid of what I don't use.