I should also note that management is likely to see this not as a wayward employee bucking the rules, but as someone doing what he needs to under the circumstances to make himself happy. So long as it's not egregious and work quality stays ultra-sharp, everybody involved is going to just work around your preferences. They know you'll be much less likely to leave if you're happy with your situation, the damage you cause by leaving is far worse than the damage caused by bucking the standards.

Around the time I was doing this, I got a new manager. I was wholly unwilling to reorient my schedule around his expectations, but I would stay until he left for the first few weeks. One day I followed him out, even though it was at least an hour before I "should" have been leaving. I'd also taken an hour-plus long lunch that day. I told him I usually leave at 5, but I was staying late in case he had any questions for me. He was like, "even though you took a long lunch??" and I just nodded, and followed him out. He didn't mention it again, until I started talking about taking another job.

There is a space in between political expectations, business needs, and personal wishes at any job that is ripe for exploration and exploitation. One can iterate towards their ideal work environment and conditions at any job where their performance is stellar. Just keep the business needs and political expectations in mind and you can practically get away with murder.