Running six cell NiMH (1.2V x 6 cells = 7.2V) is safe as long as you run properly. An excessive trigger finger could lead to overheating of the FETs and your motor, causing some problems either then or later on down the road due to an overly used motor.
In my opinion, six cell will add a little bit of speed, but the added weight will certainly slow down it's agility. I'd stick with four cell unless you really want that extra one or two mph and lose some track agility.
Also, if you're going to run six cell, make sure you never switch back to Alkaline. At 1.5V each that adds up to 9V which will fry your board.
Cheers,
Kyle.
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