You're pretty close to the mark.

Physical time travel immediately is impossible because of the rate of vibrations of atoms. However, thought already travels at light speed and can make the trip.

To travel back and forth in time merely requires that ability to attenuate one's consciousness to compatible wave structures which existed at any moment back in time.

In a small way, each time we read a history book - a small portion of our consciousness makes a leap back in time. The more we read, the more we become immersed in a group of frequencies from that era. Images, events and personalities are all interchangeable with energy of a particular wavelength and frequency.
By this process, some people become obsessed with various points in time and live in the past while living in the present.

The best sci-fi or fiction creates an attunement between the reader and the author. Creating real "artificial worlds" means introducing as many realistic or familiar frequency associations and details as possible.

The best realistic art rings true to the eye because it is based on life, models, etc. and captures and recreates facsimiles of these signals which are perceived by the viewer.

"Time" faster than lightspeed becomes one solid unit. Past, present and future merge on one level. In the case of our atomic spectra where things generally oscillate light speed or below - this spectra become a solid. That would include all the galaxies, physical worlds and stars.

But then there would be a whole NEW spectra created by these signals faster than light and this would NOT be a solid and a new sense of "time" would emerge on a whole different level!

Confused yet?

Here's a topographical way of looking at it.

Imagine an onion. One layer represents all atomic things in our universe. When you are IN this layer you must travel from one point to another anywhere in its circumference. It takes a certain amount of time to do so. However the layer ABOVE it is touching ALL spots of this layer SIMULTANEOUSLY. In this way it is in contact with all time/space at once. This layer we could call the FTL-layer for lack of a better description.

In this layer we would see that there are even things happening at this level which demodulate and influence the atomic spectra layer - at all moments in time and space.

This FTL layer would have points of demarcation as well and would be covered by yet ANOTHER layer...and on and on it would go ad infinitum.

So time travel is possible in the mind and not in the body. This is how causality is not interfered with - because the past is receiving these FTL signals at the SAME "time" the present is - at least from this higher spectra perspective!

Any beings living in any FTL type spectra would see the past, present and future of the entire physical universe at once.
The birth of galaxies and stars as demodulations of this higher energy would be visible to them. All human history or the histories of countless trillions of other worlds would likewise be visible - a historian's or storyteller's dream come true.

;-)

SDAI-Tech1