I love the exchanges during the day, the people on the street wondering, sort-of-recognizing her, second guessing themselves... that's very hot, seems plausible and quite exciting.
It might be conceivable that Bryn, if she was more at ease with sex,could be persuaded to flash someone (that has seen her naked anyway), or follow him into a backstreet for a quick blowjob (either to avoid being exposed, or just for fun).
Here are the problems I see with that, and why I am happy with the game how it is now. Please note that I am only offering my opinion.
1. The game already has story lines like that (the creep on the beach, and the creep in the supermarket), so it would just be more of the same. Maybe you could put in a scene to show the progress Bryn has made - reluctantly giving a blowjob at the beach, happily sucking off a stranger later in the game.
2. You would have to make a decision how Bryn sees herself. One thing that makes the game appealing to me (and I hope, not only to me) is the fact that we can witness Bryn's internal struggle. She wants to cling to her veneer of being a good girl while escaping from her distressing situation, and she discovers her perverted mind in the process. A lot of the appeal of the game comes from the (rather) slow burn, reluctant escalation and self-discovery.
You can see Bryn's cicadean rhythm almost as a metaphor. "Day Bryn" is the good girl, "Night Bryn" is exploring her kinks.
The daytime missions can be interpreted as the perverted side of her life seeping into her normal life.
Yes, I am reading a lot into a harmless fun exhibitionist game.
Daytime encounters would have to be written very carefully. Possibly, it would seem as Bryn just thinking "lol, yes, I'm a slut now" and acting accordingly. Could still be a fun game, but it would lose all of its appeal on the psychological level.
3. Many games, as well as many story arches, miss the sweet spot where the story should end. You can always try to one-up the previous part, but you have to get more extreme, leaving realism further behind, and trying to snatch one more story from the jaws of the law of diminishing returns.
I'd prefer to see the game have the scope of kinks that is has now - and explore them in more detail, focusing more on Bryns internal struggle.