You could use custom types to choose a mood, but that way you'd get a random mood each time - which probably isn't quite what you want, unless she's supposed to be multiple-personality or very capricious!
You can "choose" a different mood for before and after the first_throat.
If I'm not wrong, before you achieve the first_throat there will be random lines displayed from the INTRO lines if there's no activity. After the first_throat the "game" will use lines from the GENERAL lines.
(If I remember rightly, with the standard dialogue she doesn't talk when she's in ahegao mood - so presumably SDT has the ability to tell what mood she's in. Perhaps it's something to consider for future expansion!)
If there's text to be displayed in a AHEGAO_MOOD line, then she talks
And considering the ability of SDT to tell what happens... well.. if two things happen shortly after another, one is "forgotten" - should be easy to prove: just get the girl unconscious, then continue the old in'an'out until the guy comes.. shoot it all over her face, while she "wakes up" and see about what she complains..
SDT also often seems to forget about FINISH / RESTART lines..
All in all it seems, dialogue is a stepchild of SDT. Kona seems more busy to make new clothes/gadgets/hairstyles.. So, if there's someone out there to come up with a mod or something getting the ability to control SDT's action by dialogue, that would be great..
Right now the whole system is quite... boring. Too much randomness and repetition.. and some things come up with unexpected results..
INTRO lines - Will be displayed randomly during inactivity before the first_throat
GENERAL lines - displayed randomly during inactivity after the first_throat AND one line is displayed right after the guy shoots a load (which shouldn't be the case, as other lines should be used..)
FIRST_THROAT lines - repeated randomly each time the guy pushes a bit deeper than before.. so not really "FIRST" throat, right?
HELD lines - seems like two random lines will be displayed after holding her
VIGOROUS lines - seems like random lines will be displayed after treating her rough
CUM_ON_FACE lines - depending on the amount of cum on her face, more than one line may randomly displayed
SWALLOW lines - depending on the amount of sperm she has to swallow, several random lines may be displayed
Then there's still the problem with some expression actions - like [COUGH], [CLENCH_TEETH], [SWALLOW], [TONGUE] - stopping the display of dialogue, if they are interfered by the guy penetrating her mouth. Makes writing dialogue for the auto mode quite difficult
Ah well, we can all but hope...