I think the only thing that'll interest you is:
1) Comes with an overclock module so that you can adjust how fast or slow the CPU runs. Use SetCPU to have full functionality over your CPU
2) The LED light at the top of your phone will blink when you have a notification in conjunction with the trackball lighting up.
3) SuperUser is needed to ensure certain apps get the permissions needed to run and that what you want to run requires administrative privileges ("root" permissions) is ran past you.
BusyBox and ro.secure=0 is something that escapes me, but I know BusyBox was needed for Titanium Back-up. For what, I haven't figured that out yet.