While I've not bothered with Dominating, at 50% sale value you can still make money pretty easily, for one, resist the temptation to carry every single thing you find back to a merchant, take the things with the highest weight to value ratio. For example, metal armors and sledgehammers might have a good sale value, but if you divide it by their weight it doesn't work out very well, stuff like electronic and psionic parts that can be worth a few thousand but have a weight of 0.1 or so are optimal. Anything that isn't worth hauling just render down into repair kits for fixing up guns and armor to sell and for selling directly to merchants that buy repair kits, you'll generally want to sell armor repair kits the most as you tend to need less off them, and armor generally has a worse weight to value ratio.
You'll maybe be making 70-80% of the money you would by hauling absolutely everything this way, but the time saved makes up for it. You can maybe haul everything up until you return the Armadillo circuit board, but doing it throughout the game is just going to make you miserable.
In regards to the suggestion though, it would be good if difficulty was customizable, with each option such as health, healing item penalty and cooldowns, enemy numbers, etc being individually modifiable. I find the healing penalty kind of silly when you can see enemies you're fighting getting the full amount while you get half.