Not certain which forum to post this to.
I wanted to test and play with grab_mouse w/ the latest SFML revision, so I forked everything off and merged the two. I think I did everything correctly and my initial tests (integrated with my project) with Windows, Linux, & MAC OS X have been fine.
Here's the link to my fork if anyone wants to play around:
https://github.com/anthnich/SFMLHonestly, I'm not certain if you guys discourage this type of thing. So, if I made a faux pas, just let me know.