W/pnt hello,
Qn1. Are you talking about approach procedures/plates which are actually labled BARO-VNAV approach rwy 16 or somthing like that ?.
Qn2. Most definately not !. VNAV is non-precision by nature.
Qn3. We don't as a rule however,I can't say I see any legal reason why not, wether or not its the best way to tackle the approach is another question.
Best rgds