You can save at choices -- hit the Escape key to pull up the menu. I do this often, myself! As for right click we found it was a problem for folks less familiar with Renpy's default contro mapping, that they'd hit it accidentally and get pulled out of the game. We can look into a way to allow the user to change the mapping to whatever they want, though. Thanks!
EDIT: As for scrollback -- we intentionally left that out so your choices matter, but it IS unlocked after one complete playthrough of the game. Or if you enter a cheat code. :)