just played it and they allowed it. So what the hell, if Bears cover the 6 1/2, they will cover at +10 1/2 (double up). If they don't cover the 6 1/2 it is no play
go to rolling wagers/virtual money, click on it, click on nfl, you should get all the lines and alternate lines to play. Click the one you want to play, then click on show rolling wager options, they should give you your original bet that you check and it will show you how much you would be able to bet.