There's a game setting called "Number dialog options" (in "Dialogs" section).
The description sais:
Quote
Dialog options become numbered bullet points, and the numeric keys can be used to select them
However, the numeric keys choose options regardless of whether this option is on or off.
May this be considered a bug?
EDIT: I think that depends on whether it is valid to use these numeric keys with custom dialog rendering.
I'm not deliberately ignoring this post, but I have no idea.
I consider it a feature!
EDIT: If it's a bug, perhaps provide a way for people to enable the numeric shortcuts separately from the options numbering.
At the moment I am hesitating between introducing another game setting and disabling built-in shortcut but providing a way to set ones from the script.