Your only options from controlling from the middle of the boat is to go with a electric steer model. Like a minnkota Terrova.
Some guys don't like them, however I have one and love it. I have the standard foot pedal plus the wireless co-pilot remote that attaches to the current rod I'm using. I'm really happy with mine and would highly recommend them to anybody, the cost is more for one, but on a boat like mine they were the only real option.
Also if you go with an electric steer, spend they few extra dollars and get one with "Autopilot" You'll never look back, it's almost really a necessity.
Here's some from cabelas, they sell reconditioined ones, that's what I bought and have been very happy with it.
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0055423013620a&type=product&cmCat=SEARCH&returnPage=search-results1.jsp&QueryText=reconditioned&N=4887&Ntk=Products&Ntx=mode+matchall&Nty=1&Ntt=reconditioned&noImage=0
bill