The other thing you may try is to use the various zoom options to minimize any scrolling bars and or static logos that would be on the top/bottom of the screen. Not optimal but plasmas are not exactly plug and play like LCD. Regardless of any extra care required (especially initially), I still prefer their characteristics over LED/LCD. Also, if you do suffer from IR, the ST60 has a screen wipe utility. You could also use the pixel flipper program on the Disney Wow disc. Some people have reported it clears up IR faster than the screen wipe utilities. (If you don't already have a calibration disc, I would highly recommend the Disney Wow disc. It is well worth the price.)
Over the long haul I can tell you that my 2007 Panasonic plasma I treat no differently than any other television now. The first few hundred hours it could get some IR on sports due to the static logos and scroll bars but it always went away pretty easily. If there is any IR on my screen I honestly could not tell you because I do not notice it. Overall, IR is an issue to be aware of but not something to become overly worried about. If it happens, you can solve it pretty easily. I would just try to enjoy the TV and take a few precautions during the first few hundred hours.