I just purchased the Vivomove Style and this issue is already a major annoyance that I can't simply reply "yes" . "Okay" doesn't work in a lot of situations. Yes it seems like a major oversight.
I called support and they didn't even realize that "yes" wasn't an option and they were a surprise as I was. He escalated the issue to engineering and gave me a ticket number. He said to get this issue fixed in a software update more people would have to actually call instead of using the forums. So please call if you guys get some time and give them the ticket number.
Here is the ticket number for this issue: PSC-222430
Here is the phone number for technical support: 19133978200