In vanilla, you can only get a plain stone block by removing its 6 neighbours, then the stone will drop as a full block.

With this mod, you can remove 5 of its neighbours then mine the stone block and it will drop a full block instead of tiny stones. It means you can mine every other block at a given height without having to dig above/below it. This is how it looks in action: https://imgur.com/97Uo8g5.mp4

The vanilla behaviour is not removed, this is just an additional behaviour. In the screenshot below, all the "free" stone blocks (i.e. supported by only one other block) will drop themselves when mined. There is an interesting interaction between the two behaviours: if you have two blocks supporting each other and you removed everything around them (say because you are unearthing a meteor and want the full blocks), mining one of the two blocks will drop both blocks, the first because of my mod's added behaviour, the second because of the vanilla behaviour.

Affected blocks: rock, ores, meteoric iron.
The source code is included in the mod. If you want to change the list of supported blocks, there is only one line to modify.

What this mod doesn't do: change drop rates.

Unintended but harmless side effect: using ore blasting bombs on ores that are in this configuration (why would they be?) will drop full ore blocks.