That's a good tip. One thing I like about most stick baits is the slow fall rate with an unweighted wacky rig. But, there are some times when even that fall is too fast. I like the idea of the foam to decrease the fall rate and to help keep the lures for more than one fish.
Another thing I found for a slow falling stick bait is IronClad lures. They actually float if you just toss one in the lake and they have a biometric membrane inside them that keeps the lure on the hook. Once the barb is through, you have to really work to get the hook back out. I used one 4 1/2" stick bait to catch 67 smallmouth bass this spring!
And no, I'm not being paid by IronClad, but they did send me some samples to try out and I'm impressed.