The best culinary practice surrounding the water used to soak beans, pulses and rice

As a Chinese, who have had many mitten crabs in my life, I think I can provide 2 insights:

1. In Chinese culinary culture, it's not only meat that's the most appreciated, but rather the taste, texture and the freshness especially with seafood.

2. Mitten crabs during the autumn season contains a lot of eggs under the shell. The flavour of the eggs are what's appreciated as well.

Mitten crabs (not sure in the US) are safe to be consumed from food safety perspective as long as it's being cooked properly like any other seafood.

First, fully generically:

The main distinction made by The New Food Lover's Companion (Fourth edition, 2007) is that a "casserole dish",

can be glass, metal, ceramic, or any other heatproof material,

while a Dutch oven is

usually made of cast iron.

Another distinction is that the Dutch oven may be a kettle, which typically implies the presence of an overarching handle from which the entire pot may be hung (as over a fire), while no such option is offered up for their definition of a casserole.

This is generally confirmed by the fact that while, yes, both we and the marketplace (sellers) seem often to use the terms casserole and Dutch oven interchangeably, whenever the vessel is equipped with an overarching handle retailers seem to avoid referring to it as a casserole. More specifically, when you turn to high end concerns in service to restauranteurs, such as here, there's no confusion on the matter. Casseroles invariably lack overarching handles and, unlike Dutch ovens, may come in quite small sizes and don't necessarily require lids. So while Dutch ovens may or may not have overarching handles, they invariably have lids and are invariably substantial in size. The compiled side-by-side photos below, as extracted from WebstaurantStore, goes to show just how severe the contrast can be between the two items.

Second, to the question of browning:

Here are a couple of examples which seem to speak for themselves, as far as how well ceramics or ceramic coatings can be expected to perform when baking breads.

Williams & Sonoma offers a Cast-Iron Loaf Pan (photo below) about which it says,

The specially formulated black matte interior enamel contains traces of quartz, giving it additional heat resistance and a rougher surface resulting in better browning.

Williams & Sonoma also offers a Bread Cloche (photo below), for which it makes the following claim,

Duplicating the benefits of baking in a brick oven, the ceramic bread cloche turns out individual loaves with tender, moist interiors and crispy, evenly golden crusts.

I'm sure there exist any number of additional examples of bakeware, each of which possesses similar properties to these. (The links provide a good deal more information.) I hope this however is enough to help you take the plunge, so to speak, toward this option if that's what you're interested in doing.