No problem with running it through the gears and touching the redline or near there every once in a while. Holding it next to redline or at the limiter isn't so good, but nothing wrong with keeping the revs moderately up for power. Shoot, my CBR used to cruise the freeways at 7k all day long. With the previous owner's Yosh pipe, it was quite obnoxious.
If you're near redline in 6th, you might want to consider gearing up to bring the revs down a little.