Describe the feature

An in world transformation. Sky Stone Dust + Stone in ? (lava? water? being crushed by a piston?) creates two or more new sky stone blocks

Reasons why it should be considered

Aside from a config option that allows an annihilation plane to be placed at world height to passively generate skystone, there is no way to renewably get it.

While this isn't really a problem for vanilla AE2 as sky stone/dust is used very sparingly in recipes, it is a problem for a number of fields such as AE2 addons that use it more liberally as an ingredient, for builders that want to use large amounts of it and its derivatives in a base/house, or for multiplayer servers (though this one is very rare compared to the former two)

The current optional config mechanic that allows you to use the annihilation plane at world height doesn't work if you have a particuarly tall world, or an infinitely tall one using say cubic chunks. This also goes for literally retrofitting it to be an annihilation plane against bedrock, as infinite depth also has no bedrock.

Additional details

No response

In normal ae2 (including addons) the annihilation plane at world height should be enough and feasible.
If modpacks change that, it's on them to find alternative solutions.

There is also the Villager ("Fluix Researcher"), who can sell skystone.

This already exists.