Every VN of worth will allow you to skip through already read text.I will say I prefer Kinetic Novels to VNs though. Not a fan of multiple routes. From what I have played only 999 really did that one right. But even then it has the problem of a lot of the same repeated dialog which a lot of VNs do to get back to the first decision.
True you can save there. Guess, but I really think having a flow chart should be standard for the bigger games.