Haven't tested with 2.4.
SilverStripe Ltd appear to have put it into their repository and modified it to use group settings as many people have requested. I'm now submitting patches against their version (see a list here).
By the way, it would've been nice to get an email or something. I started implementing group permissions a few weekends ago in my version, only to find out (by chance) that it had been taken in house. </gripe>