Hi

Seems like you are the one maintaining the latest version of IntelliJBehave :-)
I could not get the original plugin to work with Intellij 12.1.x, but yours works, although I did have some problems:
1) There is an inefficient regex in JBehave library that causes extremely long matching time. This renders IntelliJ completely when you edit annotated step data in java code and add { symbol (you don't get a chance to close it). Until it is fixed in JBehave itself I had to write a workaround for that by ensuring the braces are closed.
2) The syntax highlighting in story files was a bit weird, with parameters being colored one character prior to actual parameter - 
![image](https://f.cloud.github.com/assets/1142787/645210/b2c0a56c-d39f-11e2-81c6-ccd9ad389016.png)
3) Some NPE's happening when I opened random maven projects for the first time, couldnt reproduce it steadily, but added some tests.

Hope you will find it useful.
Do you plan on releasing it to Jetbrains repository?

Thanks in advance
Victor