I'm 5'4", and must admit that I, too, would love an additional 1/2 turn to whole turn on that lumbar crank-wheel. BUT, I found a solution that works for me. It may or may not work for you!
I'm used to driving around (on my past 4 vehicles) with the lumbar cranked to the highest level. That's what made me comfortable, allowed me to reach the pedals, and what kept my legs from mashing the end of the seat (behind the knee). However, on the Volvo, I found that I could actually move the seat a little closer (just a tiny bit) than what I was used to, and have the seat back more upright than what I would have chosen before.
The first 2 or 3 days I poked around with all the settings because nothing seemed to compensate for the lack of lumbar that I'd grown so accustomed to. On the flip side, I realized I was actually using lumbar on my past vehicles to COMPENSATE for seat designs that didn't fit my dimensions and get me close enough to the pedals. Soooo... I tried this.
Move the seat a tad further forward than you would otherwise. Then make the back more upright, again, by just a tad. In other words, move your H-point (you know, your hip bend point) a bit forward by means of the fore/aft sliding track *and* the seat back. At first (the first 4 or 5 drives I took) the seat back seemed too upright, but somehow I've gotten used to it, and the upright back provides the same "vertical/forward" support that I used to use my lumbar for (to hold your upper body up and forward, toward the steering wheel).
I was just used to using my lumbar in past cars as a band-aid for ill-fitting seats. These ARE comfy, and I'm not saying I wouldn't love another crank or two on that turnwheel for lumbar, but I *did* manage to find a totally comfortable alternative, which is to simply have the seatback a tad more upright than you're used to. Then you get used to it, and it's no longer an issue. Supposedly you're safer that way, anyway.
As for lateral supports, love them. They're firm in the tailbone/seating area, but not too firm. Perfect!
If you get a chance to take another test drive, get all comfy in your "old" standard seating position. Then nudge the fore/aft position just a tiny bit further forward (very tiny amount), then put the backrest up a bit. You'll feel upright and hunched forward, but really, you're not. Drive it around. See if you can get used to it. I did. Good luck...