Oh my... Your choice of words. LoL!!
What um...? Exactly what do you mean foldable front cover? Because normal flip cases open like books. Do you mean you want the front case to be able to fold twice?
And I'm a bit confuse on how you're describing "other" flip cases. The case is not supposed to open unless it's cheapo. LoL!! But yea... I'm a bit confused on what you're asking.
Oh wait!! Do you mean the front cover wraps around the phone twice? So it folds over the front then around and connects on the back of the phone? Kinda like wallets? In that case you should look for wallet cases.
EDIT: So after re-reading I understand what you mean. My Nexus 7 has a flip case. If I hold it like I'm taking pictures, the flap kinda just hangs there. So you want the front to be able to fold so that way you can fold it and it doesn't get in the way of the camera while it's folded backwards, I'm guessing.
I don't see how you'd be able to accomplish this. Mainly because I've never seen a case like that. Also there doesn't look like any way to hold the case and also prevent the case cover from getting in the way of the camera lens.
For the unliving!!