spoke a little tittle too soon ... in Beta 4.1 (6.5.5) the Start/Lock button isn't working for me like it didn't in Beta 1. It's grayed out at all times. I may have done something wrong, but all I did was install new slider and the custom taskbar that I've been working on, and they both worked fine in Beta 2 as-is
edit: re-flashed 4.1 and did nothing else, the round lock button at the bottom as well as the similar back arrow when you go into Settings both worked. I must have broken them on my own somehow. Sorry! (I re-installed/re-configured all the same things and it still works!)