first off he wont be able to rupture your membranes if your cervix is not open...
i would assume the synto is via IV and put up may mean until it does something.. not put up your *xyz*
also you can say no to any of it or all of it if your uncomfortable with the process. but im sure he will say that its your babies life your threatening if you dont do it now..
Synto labours are definatly harder then natural labours.
you could ask him to hold off on the induction and do some U/s to check placenta function and CTGs to check on bubs.. and wait it our until your baby is ready.