I am pretty much an "expert" with return leagues as I have been in one for three years and won our superbowl last year with a WR corps of Dante Hall, Michael lewis and Steve Smith (who I actually drafted for his returning and was pleasantly suprised)
Dante Hall is every bit as good as Randy Moss in this situation, in fact I rank him better because with Hall returning you will never be left with less than 50 ish yards. I always draft guys who will get me the minimum of 80 yards a game, those guys being Hall, Lewis and JJ Moses as of last year. Dont just limit it to WR's though, Josh Scobey is also a pretty potent RB in this system as is Chad Morton. They make good servicable number 3 backs at least. Antwaan Randle El is another nice pick.
Basically just check your depth charts and if you see a guy listed as both the number 1 kick and punt returner feel obliged to grab them and stash them on your roster.
Its an easy way to win your league, though it does have a hollow feel to it as its legal "cheating" in some ways, but hey you didnt make the rules.