Environment

Forge version: 14.23.3.2678
Twilight Forest version: 3.7.412
Link to crash log: N/A
Side note: the modpack used is the "Do I am Cake".

Synopsis

See also #172, which is mod-specific version of this issue.
For players who set up their base in twilight forest, it may be a hard time for them to find certain types of non-vanilla ore in twilight forest, due to the combination of their generation range and low average altitude of twilight forest. Examples would be copper and aluminium (bauxite) from Immersive Engineering (both of them have min. gen. y-level of 40 by default), and apatite from Forestry (which has non-configurable min. gen. y-level of 56).
Therefore, were there stalactites of modded ores in hollow hill, the problem described above would have be largely alleviated.

Reproduction

Steps to reproduce:

1. Find a hollow hill; size doesn't matter.

What I expected to happen:
Ore blocks from other mods appear in hollow hill in form of stalactite.

What happened instead:
Only stalactites of vanilla ores (coal, iron, gold, redstone, diamond, lapis, emerald) and glowstone appear in hollow hill.

Analysis

As of e9752dc:
TFGenCaveStalactite::makeRandomOreStalactite can only return instance of TFGenCaveStalactite that contains one of: diamond, lapis, emerald, gold, redstone, iron, coal, glowstone. This means that we currently have a fixed pool of ore choices to choose. One of intuitive solution would be exposing them as a config option.
The underlying challenge will be the method of describing block state in config file - even though metadata is available for now, it will be phased out in upcoming Minecraft 1.13, which, if metadata is used, will create extra problems in the future.

This is still applicable right? https://github.com/TeamTwilight/twilightforest/blob/1.12.x/CONTRIBUTING.md

Yes

Seriously hope this is getting worked on.

Partially worked on! Kinda busy with IRL things, if you'd like to contribute some code via PR, that'd be helpful.

Is this still being considered?

AFAIK there is a WIP IMC API that would allow you do this if completed.

so many abbreviations