Admittedly, there's not a lot of need for this idea. But it's another one of those little polish things that could set iFly apart from the competition.
I'm guessing that 50% of us fly from from Point A to B and then back again. (The $100 hamburger, a day trip somewhere, etc.) So you load your flight plan and fly from A to B.
Now, even without a GPS running, iFly knows where you last were when you fire it up again for what might be the return trip home. It sees that you're at Point B. So, if you leave your previous Flight Plan loaded, how about if iFly offers to automatically reverse it for you? (This would be for simpler flight plans (VFR) that didn't have a DP in the plan.) I imagine a dialog box asking "Reverse your current Flight Plan?" Yes/No. (If you said "No," then maybe "No" would take you to the FP page for your next leg then, 'cause answering "No" and leaving the FP alone doesn't make much sense.)