Ah, i haven't looked at a stock fox booster in some time. I'm used to the larger SN95 booster.
Yes, you can unbolt the MC and pull it forward a bit without messing up anything with the brakes. The booster rod sticks out and pressed against the MC bore. Just don't turn the booster rod any and you'll be fine.
You may not need to remove however. Visually inspect and wiggle it and listen for a hiss or sign of leak. However, if the rubber grommet looked cracked, it more than likely is leaking.
Autozone sells replacments