config.lua

local AceGUI = LibStub("AceGUI-3.0")
local AceConfig = LibStub("AceConfig-3.0")
local AceConfigDialog = LibStub("AceConfigDialog-3.0")

soapyOptions = {

  -- a group, args holds sub groups
  cooldowns = {
    name = "Cooldowns",
    type = "group",
    args = {

      -- This is the group in the tree on the left
      defensive = {
        name = "Defensive",
        type = "group",
        args = {

          -- this is the group inside the right pane
          spells = {
            name = "Spells",
            type = "group",
            args = {

              -- just some prefix text
              header1 = {
                type = "header",
                name = "Defensive Spell Cooldowns",
                order = 1,
              },
              info1 = {
                type = "description",
                name = "Customize how the rotation handles the usage of defensive cooldowns.",
                order = 2,
              },

              -- This is the group for Devotion Aura
              devotion_aura = {
                type = "group",
                name = "Devotion Aura",
                inline = true,
                width = "full",
                -- these are your config points
                -- this deep their access point is
                -- soapbox_cooldowns_defensive_spells_devotion_aura_
                -- Long, but it looks nice, right ?!
                args = {
                  use = {
                    name = "Use Devotion Aura",
                    desc = "Use Devotion Aura",
                    type = "toggle",
                    width = "full",
                  },
                  percent = {
                    name = "Devotion Aura Percent",
                    desc = "When to use Devotion Aura",
                    type = "range",
                    width = "full",
                    min = 0,
                    max = 1,
                    step = 0.1,
                    isPercent = true
                  },
                },
              },

            },
          },

        },
      },

    },
  },

}

-- this bit would be inside the core but its here for now
-- you'd only see the top part
injectBase = { }
injectBase['soapbox'] = {
  type = "group",
  name = "Soapbox",
  childGroups = "tree",
  args = soapyOptions
}
coreBase = {
  type = "group",
  name = "Soapbox Config",
  width = "full",
  set = function(info, ...)
    local key = table.concat(info, '_')
    local t = { }
    for n = 1, select('#', ...) do
      local e = select(n, ...)
      t[n] = e
    end
    ProbablyEngine.config.write(key, t)
  end,
  get = function(info)
    local key = table.concat(info, '_')
    return unpack(ProbablyEngine.config.read(key) or { })
  end,
  args = injectBase
}

AceConfig:RegisterOptionsTable("Soapbox", coreBase, "/soap" )

-- This will open the config window
-- AceConfigDialog:Open('Soapbox')

-- Inside a library call
-- using the percent method gives 0 to 1 value, so * 100
-- local value = ProbablyEngine.config.read('soapbox_cooldowns_defensive_spells_devotion_aura_percent') * 100
-- local evaul = ProbablyEngine.dsl.eval('target.health <= '.. , 'target', 'Spell')

My example of what the config tables will look like and how we'll use them in PE 2.