I'll try to answer your questions....
Question #1-Does the dive op we will be using let you dive your computer or do they herd us on and off the boat like cattle and put a stupid time limit (like say 35-40 min.) on ya no matter HOW much air ya have left?
Last year, the dive boat let us dive our computers, however they requested that we be back in an hour.....some pushed it by 10 minutes and they did not gripe at us. They know our group, they know we're good and they know that we know what we're doing. I will say that many of us left a lot of air in our tanks even after 70 minutes, because the diving is shallow and easy. Also, SD tries to buddy you up with someone of similar air consumption.
Question #2-What is the schedule for the boat dives like? Before breakfast? after? 2 after breakfast one after lunch? Is there enough SI time between dives for those who don't want to use nitrox to off gas enough to get a decent amount of time in on the second and third dives?
Leisurely breakfast, then 2 morning dives. Back to the resort for a long lunch break, then 1 boat afternoon dive. Back to the resort with plenty of time for us to do an afternoon shore dive. Happy hour at the outdoor bar, then dinner. If you want to do night dives, please skip the Happy hour!
With SD, when you take your first drink, that means you're done diving for the day.
We had a mix of air and Nitrox divers, and the SI's were fine for the air breathers.
Hope this helps! We'd love to have you come along.