Does any book besides 5D do it their way, where you can bet ( later) of off an existing bet ? Most seem to require betting the If bet, when you make the original bet ?
I use this more now, since you can't move money. However 5D doesn't allow reduced juice bets to be IF bet off of.
At BetJam, I haven't done it in a while, but I think there's a box labelled "rolling wager" that, if you check the box, makes the bet that you are currently keying in an "if bet" on the "rolling" wager that you've checked.