Scubafanatic
1) Gloves - If it's a safety issue you may wear gloves. My hands get really dry and start peeling with no gloves so about half way through the week, I did start wearing my gloves. Although the rest of my body was fine, my hands were very cold. After one dive my hands were stinging in the lukewarm shower water - this was a sign to me that I needed to wear my gloves.
2) Dive lights - They say dive lights are not allowed because it messes with the natural habitats / habits of the marine life. However, if it's a safety issue they are allowed. One diver felt that for safety reasons he needed to have a light on the last dive of the day. The DMs advised that they were NOT going to look through his pockets. I have to say, I can't really remember a situation where a light would have come in handy.
3) Night / Transitional dives - I can only remember one day on the 4th dive that it got a little "dusky". The last dive of the day was generally around 5:00. They had just switched to DST so we had plenty of light. We did do a night snorkel with the silky sharks which was very fun. The DMs lit up the sharks as they were going under us.
4) Anal probing - This was by far the most hands OFF group of DMs we have ever encountered. As I said in my trip report, they gave the brief the night before (and gave the worst case scenario) and in the morning we just suited up and went diving. There were always 2 DMs in the water - one with the inflatable group and one with the tin group. However, unless you followed them, you would never have known they were in the water. We did request a guide on one dive and the DM led a group of us. There was absolutely no checking air, depths, computers - Nothing.
Even with the lack of mantas, we had a great time. We had a great group of other divers and that made the trip all the more enjoyable. Additionally, the Nautilus Explorer is a very well run boat.