If you submit in SLI or CF I cant see that the missing dropdown menu makes a difference at all:p After all, by submitting a single-GPU score in those ranks will give you less points than if it was submitted in the correct one.
IMO this issue looks a bit like the one with the old 1m versions, without decimals. When you don't know the decimals, you set it to the "worst case scenario" - 99. Same here, you don't know the number of CPUs, you assume it's 3 or 4, and move them to SLI or CF - unless it's OBVIOUS that it's a single card.