That's easy!!
Lighter in-water weight for DSLR housings (based on specs for d200 housings)!!! How about at least neutral with camera/battery installed/fixed focal lens & port to start (no handles, arms, strobes, sync cords etc.)
A pound or two of negative underwater weight for the entire system is fine. But when a DSLR system starts out 2-1/4 lbs negative w/camera to start, w/o any handles, strobes/arms, focus light, sync cords, adapters etc. it quickly gets into a range (well over 4+ lbs negative) where injury can result from strain, especially at significant depths. Nitrogen bubbles love strained muscles and joints to gather in. [That's why we as smart divers don't work out right before/after a dive and shouldn't have to "work-out" during a dive at depth just to position a very negative camera setup.]
Specs based on repeated in water weight tests with Rapala scale of Subal ND20, Nikon d200, 16mm lens, glass dome port = 2-1/4lb negative in water weight before even any handles were added, to say nothing of the negative strobes being made today!!!
(But before you shun Subal weigh your own, I hear the Aquatica and Sea and Sea and others are even more negative to start. But of course weight tests must be made with the same (exact as possible), camera/lens/port)
Also how about 'positive in water weight' strobes with batteries installed? This used to be the norm but now sadly is not. Even my new 110s are negative with batteries, but not as negative as other alternatives.
Manufacturers please care about divers who actually use the product a lot! Not just what sells at first glance or looks like it is easy to pack or take on a plane.
Also salespeople please care about the customer, and what is best underwater for him/her, not just profiting from a large $$$ sale. Retailers have the power to make manufacturers change this producing of such negative 'in water weight' housings/strobes. What is sold should be sold with integrity and not just a "hard-sell" approach to make a profit.
Yes that listened to would indeed usher in a merrier 2007 and beyond!
Carol