Hahah....I wore the same thing for 5 days! Mainly cause when I was out and about....I had the same swim shorts on and nothing else. It is certainly paradise on earth!
50/60mm macro and diopter is the most important thing I would have on ALL dives at Mabul/Kapalai. All your dives at Sipadan will involve a single boat trip out to Sipadan Island.....the surface interval will be on Sipadan itself. Then, the boat comes back for you to take a break before they take you nearby for a Mabul/Kapalai Boat dive.....alternatively, the Mabul and Kapalai dives will come first.
As such, if you must switch between Macro and WA lenses and ports, you can do it at leisure at the resort. Vis is so bad that I don't know how well 100mm would suit conditions. I am just picking up using a DSLR for UW use and have not tried it there yet. The pictures I posted here was using a DX-1G and a single strobe and taken in Mabul/Kapalai/Sipadan.
I would advise that you try get in on the EARLY morning dives at Sipadan. Vis and fish activity are much better then. It is also when the Bumphead parrotfish school nearby at the drop off. I was also lucky enough to spot 3 large oceanic hammerheads too at 40m!