Actually, I made a small mistake — you're right! In versions 0.0.5 (same as 0.0.6), those hotkeys really aren't there yet. We only added them in version 0.1.0. Sorry for the confusion! But we’ll include them in the next update on itch.
You're absolutely right that sticking to familiar shortcuts for players is the better choice — thank you!
When you mention the save sorting, do you mean how Ren'Py shows them in a gallery/grid layout, while ours is a list? Or did you mean something else?