Is it possible to add to the config that we are able to edit outcome amounts ? like you displayed on the page: 

so we can edit the nodes our self 

Stone Node (Rock, Hammer, Jackhammer):

1. (Rock) sulfur: 100, metal: 250, stones: 375, hqm: 2
2. (Hammer) sulfur: 143, metal: 357, stones: 536, hqm: 2
3. (Jackhammer) sulfur: 300, metal: 600, stones: 1000, hqm: 2

Metal Node (Rock, Hammer, Jackhammer):

1. (Rock) sulfur: 100, metal: 250, stones: 375, hqm: 2
2. (Hammer) sulfur: 143, metal: 358, stones: 538, hqm: 2
3. (Jackhammer) sulfur: 300, metal: 600, stones: 1000, hqm: 2

Sulfur Node (Rock, Hammer, Jackhammer):

1. (Rock) sulfur: 100, metal: 250, stones: 375, hqm: 2
2. (Hammer) sulfur: 146, metal: 364, stones: 548, hqm: 2
3. (Jackhammer) sulfur: 300, metal: 600, stones: 1000, hqm: 2

Hello,

Currently LegacyNodes is compatible with WhiteThunders GatherRates,

https://github.com/WheteThunger/GatherRates

This (GatherRates) works with global permission modifiers (gatherrates.ruleset.2x), this also works with ItemOverrides, allowing you to set custom gatherrate amounts per material. It utilizes gatherrates as the base math which controls the output of each node is drawn from the default node amount, and where LegacyNodes finds a modifier from gatherrates, it converts it to the original amount, maths out the amount for each extra material per node and re-multiplies it depending on the applied modifiers.

In short, you should be able to get the functionality you require from utilizing GatherRates along side Legacy nodes. If I've mis-understood your requirement I apologise and if you could go further into what you require, i can take a look and its feasible within the current scope I'll certainly add it and update :D

If you'd like to add me on discord or post further here, we can talk more about what you need if gather rates doesn't cover it, and see about implementing it for the next build :P