Most of dialogs have such option in Doll play section. Vira does not have any sprite configuration to play with so no Doll play section.
However I consider making the "Skip dialog" option configurable in hth_config.xml file. Such thing is already supported in current version scripts.
For example dialog "default" state may contain following lines:
<if vari="dialog_skip_option" value="available">
<resp newstate="options">(skip dialog to sex scene)</resp>
</if>
Then the "Skip dialog" response would appear only if someone put line in hth_config.xml file:
<set vari="dialog_skip_option" value="available" />
otherwise (or with different value) it would not appear.
That would make the game enjoyable for those players not interested in dialogs at all. And there are such people.