We still don't know if it's possible to make multiple rolls for SPECIAL check.
Sorry, forgot about this one.
With current crit table it's not possible to make multiple stat rolls for 1 crit roll. It's not impossible to add second roll but it's not 5min job to add it, not to mention testing it properly. So I would say possible but not any time soon because there are other things to finish first.
I always feel like 1/2 of all suggestions can be eliminated merely by coding/engine limitations of some kind.