For special drops like compressed coal/iron (chance of dropping multiple coal or iron from ore) - in order to reduce chances of players repeated placing & destroying the ore blocks to gain extra resources perhaps allow drops to only occur if there is no logblock record for that location (if the logblock API allows us to check this).

This will not avoid those that place/destroy in a different location each time but would slow down players that don't know about this option and keep trying on the same place.

Low priority - can be avoided by not dropping multiple ore blocks from an ore block (alternatively drop ingots from ore?) or minimised by causing much greater damage to pickaxe when dropping the multiple blocks

Careful; if you grow a tree in the same place, this sort of thing could cause problems. Similarly with for example spreading mushrooms and other natural changes.

Yeah... true. Could check the logblock record for the type of block and only ignore if it's the same type being placed again. Lower chance of issues with trees/growth/etc. Could still be abused but might be useful.