A system like this should be aware (programmed) of the specific gearing used and know where in that gear combo you are. Therefore, I hope SRAM allow the following:
When shifting up to the big ring, use the gearing info and position to automatically select the appropriate rear cog to give the next hardest gear combination available, whether that be one shift or two, making the step perfectly in sync. Likewise, when dropping to the small ring, choose the appropriate rear cog to give the next easiest combo available. Smooth transitions, done by knowledge of specific gearing inches and position. Should be easy.
You're basically describing sequential shifting. But, I doubt that this SRAM setup will allow it.
Speculation: I believe the signaling logic is setup such that...
Left lever sends signal L
Right lever sends signal R
RD receives L alone, shift down
RD receives R alone, shift up
RD receives L+R, do nothing
FD receives L alone, do nothing
FD receives R alone, do nothing
FD receives L+R, checks where it is now, and moves to the other position
That is extremely simple circuitry, no junction box needed. But for sequential shifting you need a unit to interpret lever input, store current RD/FD state, and output instructions to the FD/RD. This SRAM setup doesn't appear to have any memory or processing, unless it is all tucked into the hoods (doubtful).