by physics do you mean .physics tag? if yes, then just use old one. If not, copy values from old .vehicle tag at the bottom.

Do you mean like how when you try to turn the pelican turns so slowly and it's hard to look up (at least that's what I think whenever I try to use pelicans)? If so, you can go into the .vehicle tag and scroll to the bottom, there are a few fields that modify the turning rate. For the ease of going up you can then scroll to the "seats" section and modify the pitch auto-level and range fields