hydracore can be found here:
http://forum.xda-developers.com/showthread.php?t=1789397
and directly here (newest version):
http://forum.xda-developers.com/showthread.php?t=1749863
i use version 1, searching the link i've seen there's a version 2b from today!
about the button lights:
if you have autobrightness on the button lights will come on every time when you turn
on the screen. with autobrightness off the lights will only come on when changing the
brightness (you have to enable/disable it once in settings/device settings and reboot,
then the "off" will stay)!
about two su's:
dont think its a problem, as long as you do not mess with the binaries!
edit: i flashed v2b before a few secondes, works as well as v1