Well scenario 1 is an easy lay down. Not really worth playing unless it's a keep the pot small type of 2nd limp and see what happens. I know this gives you very little info, but, the real option is folding here.

As for scenario 2. The limper tho has proven time and time again to just limp, and see flops, and has thus gotten this far. I'd say, either shove or fold. I'm for folding as the limper is down to 20 BB, and you still have blinds to act as well. Remember that you want to shove w/ said hands when in an uncontested pot, even the uber limper is a live opponent to the pot. Just my opinion so, GL all.