I use an inert gas preservative in my not-full bottles. Since CO2 is a large ingredient, I'm not so sure it works as a preservative with developers which interact with acidic compounds -- certainly in my experience it has not seemed appreciably better than just atmospheric gases with paper developers. With fixers (acidic) it seems (subjectively) to help preserver. Collapsable bottles are another option, though I agree the best are small one-shot bottles completely full.
Can D76 be mixed one-shot straight from the powder to the working solution by weighing the powder? It seems this would increase the shelf life indefinitely.
If you mean the commerical stuff it can't be a good idea. How do you know the powder is perfectly mixed? OTOH if you mean stuff you mix yourself that's exactly how I mix film developer up.
"Can D76 be mixed one-shot straight from the powder to the working solution by weighing the powder? It seems this would increase the shelf life indefinitely."
Use ID-11 instead, it's a liquid concentrate
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