Milky Way

In the config, the values bucketTimer, worseBucketTimer, bowlTimer, and bottleTimer all correspond to the cooldown (in seconds) of the four types of milkable mobs.

There are four entity type tags: milky_way:bucket_milkable, milky_way:worse_bucket_milkable, milky_way:bowl_milkable, and milky_way:bottle_milkable.

• By default, mobs like cows are put into bucket_milkable, and mobs that would provide worse alternatives (such as mooshrooms or yak from Environmental are put into worse_bucket_milkable.
• By default, a mob in worse_bucket_milkable has a full-day cooldown, whereas mobs in bucket_milkable only take half as long.
• Putting a mob in both bucket_milkable and worse_bucket_milkable may have terrible consequences!! (I wouldn't know because I haven't tried, it's just that scary.)
• Other overlaps like bowl_milkable and bucket_milkable are fine, though. For example, cows can configured to be milked with bottles using Neapolitan so they're put in both bucket_milkable and bottle_milkable.

There is now a (frankly exhaustive) data map where you must include all relevant mobs, cooldown timers, items used to extract resources, etc. Each entity type in the data map corresponds to an items list, which includes a specific value for each relevant parameter corresponding to said item. Check out the default map here.

To help parse the map, consider the humble mooshroom:

"minecraft:mooshroom": {
      "items": [
        {
          "item": "milky_way:buckets",
          "seconds": 1200
        },
        {
          "item": "minecraft:bowl",
          "seconds": 600
        },
        {
          "item": "minecraft:glass_bottle",
          "seconds": 400,
          "mod_loaded": "neapolitan"
        }
      ]
    },

A mooshroom can be "milked" with a bowl (for stew) or bucket (for milk), so the corresponding item is detailed along with the time it takes for the mob to replenish its stock. If the mod Neapolitan is loaded, the option to milk the mob with a glass bottle is also made available.

In this case above, each mooshroom only has one "resource timer"--harvesting mushroom stew makes it impossible to get milk OR stew for the next 600 secs, and vice versa. However, if you want separate resource timers to replenish at different rates, you can add a milk_type parameter:

"minecraft:mooshroom": {
      "items": [
        {
          "item": "milky_way:buckets",
          "seconds": 1200,
          "milk_type": 0
        },
        {
          "item": "minecraft:bowl",
          "seconds": 600,
          "milk_type": 1
        },
        {
          "item": "minecraft:glass_bottle",
          "seconds": 400,
          "mod_loaded": "neapolitan",
          "milk_type": 0
        }
      ]
    },

With this, a mooshroom would be able to give milk every 1200 seconds and stew every 600 seconds, disregarding the other resource's timer. Note that milk_type takes in a byte value, so if your mob has more than 255 different resources or timer-based item interactions you're going to have a bad time and frankly, you deserve it.

For those wondering why the bucket is denoted as milky_way:buckets and not just minecraft:bucket, nice catch. It's a sentinel value; please reference "Item Tags" below.