5-10 nl shorthanded, and this guy keeps making it $110-$250 to go

Theres nothing wrong with limp reraising a guy like this with a-k...you put the pressure on him and now HE is forced to put all his money in with what he figures to be at best a coin flip and dominated a lot, thats his problem now. And if you were to hit a set on the 7-4-2 board...you lead into this maniac..he'll think your weak and will raise you..and if he actually has a hand, he'll definately play it for all his money. Remember Doyle.....

[Leptyne]

Your position and stack does give you an advantage that others don't have, so make use of what you've got. This player has changed the table dynamics and put everyone in a trapping mode. The others are waiting for this guy to act in front so you have to wait for him to act and the rest to fold, leaving you HU. Requires patience, discipline, and of course luck. This does sound a lot like Doyle. Build your stack thru uncontested pots so you can afford to call when behind with outs. Also play around him and work on the other three stacks. When these guys are on a rush just stay out of the way.