I think the best thing I have purchased recently that makes at least the end of each dive more comfortable is a dive boat coat! It would be cool to have a dive boat blanket to cover my legs made of neoprene.
I good fleece lined one in neoprene with a hood is good, ecspecially for you year round divers.
I would reccomend a few other little things, like a small bag for the collections I find underwater, sharks teeth and the like. It would be cool if someone invented little velcro pouches that you could fill with sand on days that you were short of weight.. or something else compact, cheap and portable.
I would love something to help my ears out.. after a dive sometimes I just can not clear my ears and end up with horrible ear infections and it gets expesive.. after a 4 tank dive I can pretty much count on a docs bill and antibiotics.. something that worked to prevent this better than the cheap drops on the market or the ear covered mask (does not work for me) and other options I have tried.. we need something new here!
I would reccomend something for shelpping gear on sand.. I found wheels for the botom of a tank and that is nice for long docks.. It would be nice to be able to leave it on the bottom and just fold them under or have them in a way it would not be in the way for the actual dive.
a better way than velcro to tie on your mask and snorkle when your getting ready would be nice.. something like a rubber band that could be pulled off and on like the octo holders around today.
I love my springs on my fins.. but I am short legged and even with those it is hard to get my fins on without enough room to get my leg up half way.
Ok.. I could go on and on here.. I have a little engineer in my head..
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Email me or call me for more.. evenings are better if your calling (like after 6pm) my # 321-299-5796 and my email is tinaoconnell [ at ] cfl.rr.com