That's the clunky way to do it. I'd much rather use a built in (hard wired) method like pwr+home or pwr+vol dwn.
The leedroid tweak takes longer (gotta hold pwr for a second) and obstructs the screen as well. Also, ever tried to take a screenshot of your notification menu using the leedroid method? Holding pwr for 1 second automatically closes the notifications.
Could the HBOOT have ANY IMPACT at all on something like screenshots with pwr+vol dwn or pwr+home? I ask because this doesn't seem to affect everyone, and I can't fathom how this behaves differently on different phones running the same ROM. It almost implies to me that the hardwired screenshot is not part of the ROM, but perhaps the ROM or kernel is able to interfere with it (break it). Could that be part of the HBOOT?