If you edited a game using RPGM MV before then this is not much different, the major differences is Shaso heavily uses common events and there is also a translation file with the english dialogue. (Oh, and it's all in Russian)
If you're seaching for dialogue I assume you have opened the Data folder up as a workspace in NP++ and are searching there.
(If not, let me know if you have another way of doing it)
Doing a search for english dialogue will only get hits in the translation file but immediately before the translation line will be the original line in Russian, do a search for this and that should help you find what event/map that dialogue is in.
You could either edit the translation or find the dialogue in RPGM MV and edit it directly there (if you edit dialogue there it won't try and translate it and while just display your dialogue instead.)
From what I can see LST is Control Variable 0014 and Special Lust is 0083
So if you have tools to edit the game maybe add +1 function to the Light Change "button" in the Arcade or something.
Alternatively, that Save Editor mentioned by Slight Chance above looks like a much simpler route, never tried it myself.
The thing with these variable is while they can lock you out of things your actually choices are often non-existant if you want to progress the story at all, that is not even anything to do with opening H-scenes.
That is this games major weakness imo, a lack of choice. There is no "Will you let Noemi become corrupted?" Noemi is going to become a whore if you want to progress further.
Ironically, the Prison sequence is the one where the player actually has the most choice and freedom concerning what happens to Noemi.
Shame the rest of the game doesn't have that.
That whining aside, I would still recommend Dilmur.
