Why not? It's an inexpensive tweak and can easily reverted.
Most definitely. I didn't reply, because I had already decided in my mind that I was going to do a little experimenting anyways. IMO, it's the perfect winter project. I have some NE5532's that have been powered up for around 21 years 24-7-365. I applaud that chip, and the design of the piece of equipment they are installed in. I know it sounds crazy, but maybe keeping them even a little bit cooler might be beneficial.