Unfortunatly its not. Inertia has nothing to do with gravitation. Where did you hear that? And if there is a way to neutralize it - who knows. On the Enterprise they can, with the Inertia dampeners. Just nobody knows how they work...
I think for interstellar travel, we need to think completely outside the box. The concept we are used to, to move physically through space from A to B, is not applicable for that. We need to manipulate the structure of space itself.
The discovery of gravitational waves may be a important piece of knowledge to go in that direction. I participated a little bit in that - a very little bit. By processing data from the LIGO peoject at home.