If time doesn't exist......

If time doesn't exist, there would be no past or future, so your question contradicts itself.

However, if our restricted perception of time was removed, it should be possible to move along the 4th dimension (time) as easily as we walk across the street.

But would you really want to?

If time doesn't exist then that means I don't have make that payment on Friday! Yippee!

Its a question unable to be answered by science right now. We do not even know if there is a fourth dimension for sure yet we jsut have theories about it.

Sure it can. Science has quite a decent understanding of time.