My advice, concentrate on what your good on, I have both unrestricted licences B1 and B2, but specialising in full B1 work including AV and X electrics,
The aircraft is a massive complex machine and jack of all trades master of none does not incorporate safety!! Having multiple aircraft on your licence can be hard enough, I can be called up to the flight deck on three different types in an hour.
At the end of the day if someone is happy signing for something they have no competance in, more fool them.
