My suggestions are as follows:
1- A way to show two gas mixes on screen for side mount divers or back mount with a pony bottle like I use.
2- Show the MOD on screen as an option/customization
3- fill all the empty spaces (eg. in top left corner) with stuff like CNS or OTU vs the limited options for time etc. Bottom line, let us put more stuff on screen and open up DM5 to allow putting anything anywhere
4- An MOD variance alarm. If your MOD was 100 feet allow the diver to set 5, 10, 15 feet away from The MOD for the alarm (would need a metric version of this too)
5- Expand the menu options during dive to do things such as adjust brightness mid dive and clear compass bearing etc. Compass history would be nice if you change the bearing points lots during complicated underwater nav so you can return following the reverse course. Also add an actual mark for reciprocal heading. I realize it states how far off course you are so going to 180 offset works
6- Auto dim the brightness when the battery is running low to conserve life for when we may not be able to readily charge or more importantly if the computer battery is dieing and needing replacement because it runs low much faster. Having the expanded menu to dim brightness would also aid in this.
7- Better naming convention for tank pods
8- Allow us to enter our name into the actual computer so when it's turned on you can see who the computer belongs to and ensure you're using the correct one. May sound ridiculous until you get a bunch of people using the same computer and they get mixed up during repetitive multi dives over multiple days. Rinse bins can get chaotic and things get shuffled very easily.
those are my main suggestions. I'm sure I'll have more as time goes by. Looking forward to using this on my trip in 2 weeks versus just pool time
Thanks for your consideration!