What amenities am I within my right to ask my township to provide to residents on a private drive?

You might need to consider dedicating your road to the town.  Is there a reason that the drive is still private?  You might benefit from dedicating the road way in getting maintenance, road improvements, etc.  You are paying taxes for schools, garbage pick up, police department, etc.  not just road maintenance.  Do you get garbage pick up and other amenities?  You might want to start by approaching the town and discussing your concerns with them.