I would not recommend using an alternative 12volt source as the brake light is part of the safety control for this system, without it you will be able to activate the blip when accelerating resulting in who knows what outcome (not likely good). Also make sure the isolator unit is connected ( separate harness that you connect to red box) without this in the event of CAB unit failing the blip will not be cut!
pictures below of how i mounted my unit and the instructions for the 07-08 R1
A couple of notes i got from Pete the creator (top kiwi bloke!) of the CABS unit via text when i sourced my secondhand unit.
super helpful guy who even sent me some parts i was missing (for free) and gave me all the advise one could ask for.
I have asked if he could send me all the info he has on his units and if he responds i will post here for all to see.
Notes that may help from Pete:
to check the module is alive hold the red from the loom to a 12 volt battery positive and then touch the grey wire to the negative and see if you get a audible double click from the cabs box and the red light flash. The adjuster for the blip should be set in the middle of the adjustment.
the cabs is normally open and activates when it gets a ground signal. If you have a push sensor for your upshifts then you will need a pull sensor for downshifts
when you connect to the ecu, really look closely at the wiring info as it is from the ecu point of view but you can see which colours should be next to on the plug. This is the bit most people get wrong.
note i did not attach the unit as per designers instruction, i made mount out of right angle aluminium and cut to suit (mounted under brake res/clutch guide bracket) and the activation switch is bolted to the underside of the left-hand stock clip-on locating bolt hole (flat aluminium plate)