I'm just working on yet another test / demo project (I'm learning a bunch of different web technologies over the Christmas break) and I realised that WebStorm's Project Settings page could really aid the programmer, where currently it does very little except set up resource folders:
One useful project-specific thing would be "file types per project".
In a web project, I really only want a few files to choose from; the rest just get in the way:
Komodo has a pretty decent set of overrides per project:
I don't know WebStorm well enough yet to know what else could go here, but it's food for thought.