Yep, this complaint has been posted on this forum several times when the Pace Partners were released, but I don’t see them changing anything any time soon.
I do about a 1 mile warm up while still on the screen for selecting your ride. I know I don’t get credit for it, but I also can only ride with Diesel Dan, so it’s a fairly manageable pace without a lot of warm up required for most users. I can see where the faster Pace Partners would need much more warm up time, and I wouldn’t want to lose out on that credit.
Unfortunately I think what you’re doing (logging 2 rides) is the best you can do for now. Zwift hasn’t been very responsive to customer requests in this forum for a while.
I still voted for it, though…you never know!