I know that most of the sketches flying around the internet show, that the KERS motor is connected to the crankshaft of the engine, but by the rules it does not has to be.
When there was talk about the "RBR start only KERS" it was something that crossed my mind. (I know that in the meantime the rumor has been put to bed)
Nevertheless, technically you could do something like this:http://www.ukintpress-conferences.com/c ... erroth.pdf
just replace the starter motor with the KERS motor, and you have a neat "start only KERS"
As for the other aspects:
While it is true and correct that the KERS function has to be operated by a "on-off switch", I don´t think, that this has to translate into a +60kw input on the rear wheels.
You can activate a controlled release rate by the push of this buttom - IMHO
(open loop control)
Note that in the technical rules, it is explicitely stated that clutches for the KERS system are not subject to the limitations for the "normal" clutch.
FIA wrote:9.2 Clutch control :
The following applies only to the main drivetrain clutch or clutches, any clutch used exclusively as part of a KERS is exempt.
make of this what you like, but I can imagine some room for "creative engineering" here