The Flexbit file /usr/setup/ezx_flexbit.cfg is something like analogue on the seem edits in the non-linux phones. Briefly it can lock and unlock functions in the phone firmware. Currently we know too few flexbit mods, but more will come with the time (sadly Motorola never released manual on the flexbit). As soon as we find more - you will be informed.
Flexbit editing is recommended for expirienced users only.