My idea to solve this problem is to insert bookmarks during game play. Everybody could insert bookmark after some great fun he enjoyed. For example I can have really hard fight taking 5 minutes and no time to create a bookmark. But when i have a time, I could use a shortcut to activate menu and select where I want to place the bookmark. The option would offer you 10 choices using keys 0-9 and representing last minutes. If I press 0 it would mean I want to bookmark the current moment. If I press 1, it means I want to bookmark one minute ago. If I press 5, this will add bookmark 5 minutes ago and if I press 9, it will add bookmark 9 minutes ago. This is very simple, just pressing two keys. Then after end of enduring confrontation, you can go to Replay and load the game. You will see bookmarks in the upper right corner as horizontal lines indication the moment which you bookmarked. If you click it, the feature will rewind you there immediately. Then you can start viewing that part. Possibly button next and previous bookmark would be also great improovement.
