There was always an option to book it online. I booked a flight also SFO-DPS via SIN 6 months ago and within each leg it use to ask if you wanted to add a stopover. When I say stopover I am not talking about stopover package where you get to book discounted hotels etc. I am referring to having the option to select which city you want to stopover at and how long before you depart to the next destination. The city must be one that the flight is scheduled to stop at either as a fuel stop or a stop where you need to transfer aircraft. As mentioned earlier, I have booked SFO-SIN, stayed 2 weeks and then carried on to DPS. Then on the return left DPS, 4 hour transit in Singapore then onward to SFO via HKG. This was all done on the website.

The website 6 months ago was an older version of what it is today. Each time then when I logged in it use to ask me if I wanted to stay on the current website or go to the beta website. The beta website is now the current version of the website. That is my understanding.