Hi danorst. I truly am sorry you had a bad experience with the product and I apologize.
Regarding the roundness, the main issue is the "tail" (the hook part on the corner of the box) won't adjust automatically based on the roundness. I thought about this issue quite a bit, and ultimately came to the decision that to make it as simple as possible to work (and still customizable) I chose to explain in the tutorial how to customize this, but as far as a slider there's unfortunately just not a way for it to adjust the tail at the same time as the roundness.
Regarding changing the size of the message shifting the anchor point, I'm not sure what you mean – when you go to the controller, and adjust the box X slider, the anchor point does automatically move? Perhaps you're using an old version of the product?
Regarding the back-and-forth conversations, I have the 'conversation templates' set up just for that purpose. If you check out the tutorial "6-conversation-templates" it goes over this in detail.
My #1 goal is to make sure everyone who purchases my products are 100% happy with the final results, so please reach out to me at firstname.lastname@example.org and let me know what features you'd like to see or if there's anything else I can do to help you out. With any of my products, if you're not happy in any way you are entitled to a refund, so just reach out and let me know how I can make this right for you.