I just finished writing the script for then next chapter (Chapter 5) and there will be a lot more branching of the storylines based on your decisions, and you will be able to actually even stop certain paths completely. Also, all sex scenes will be optional starting in Chapter 5, even those with Emily and Isabella. It was necessary for the plot progression to make it mandatory with those two love interests, but now it will not be necessary.
For the conference room scene, I somewhat agree with you. Giselle's response actually varies depending on whether you have slept with her or not. She was always going to be amused, but she has more specific things to say if you have have had sex with her. What I should have handled better was Brooke. Her response is the same whether you've slept with her or not. Now, in my mind I thought she would be upset even if you always denied sex with her. That's because she has clearly indicated that she is very interested in pursuing a relationship with the main character. I mean, she offered sex to him on two occasions, so she is clearly interested. So I thought it was okay for her to be upset regardless of your choices. But in hindsight, I should have given her a much more muted response if you never had sex with her. In fact, I think I'm going to change that with the release of the next chapter. That won't help you since you have already played it, but it will be better for folks new to the VN.
Thanks for the input, I appreciate it!