[cwar]

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Cwar, how would your opponents exploit button limping? By raising most of your limps, I assume? Because if so, that in turn is a very exploitable counter-move. You simply limp some of your stronger hands as well, and your opponent's OOP raise will either win him a small pot (when you hold a J4o type hand and usually fold), or he'll be set up to play a larger pot OOP with an inferior hand (when you hold a decent hand, say K J, and call).

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Its much harder to develop a good metagame in regards to limp reraising or limp calling than it is to just raise or fold. Its so hard that I suspect it may not even be as profitable as raise or fold so I generally take the easier route and just dont worry about this and use the simpler r/f.