So here's something interesting...
When I switch from Dynamic to Dynamic (the alleged partial Dynamic present on restart to the full-function Dynamic after restart), I'm usually already moving down the road. With exceedingly rare exception, I'm in manual mode. Note that this means I'll see M1, M2, etc. in the lower corner of the MFD. If I'm not in manual mode, there's some factor that also means it's unlikely I'll mess with Drive Select at all on that trip, either.
For some reason, I sat in the garage this morning after arriving at my destination and screwed around with the Dynamic to Dynamic mode selection (I hadn't already set it to "proper" Dynamic on my drive).
The transmission was in P when I changed modes. I moved the selector down to D *without* bumping the kick-down to go to sport mode, yet S showed in the lower corner of the screen and idle was at about 1,100RPM. I then bumped the kick-down, and it switched over to D, and the idle fell to about 800RPM. Hmm. Interesting.
So from that point, I left the transmission in D and returned to the Drive Select button. I pushed it five times to cycle Dynamic to Dynamic, and what do you know- idle rose back to 1,100RPM, and the D changed back to S.
What's more, when I switched over to manual mode from D, the idle remained at 800RPM... but when I switched over from S, it held the elevated 1,100RPM.
I'm likely going to try this same sequence with some measuring blocks being monitored for the other Drive Select-controlled systems, but I suspect that Dynamic isn't actually falling out of true Dynamic mode on a restart. I think it's just that the ECM mapping between D and S modes is also mapped to Dynamic, thereby making the five pushes of the Drive Select button effectively the same as just putting the transmission into S before dropping into the manual gate. It's pretty apparent to me that manual mode holds the characteristics of D or S when you go from either one to manual mode. "M1" on the MFD makes it seem manual mode is manual mode with no variation, but it seems there could almost be MD1 thru MD6 and MS1 thru MS6.
Did everyone know this and I'm just strange?