It would be really nice to see a new option under constructors to only place when a pattern is requested. Such as: If I set a pattern to place Stone and get LivingRock, and I request 5, the Constructors with those patterns should each place one Stone until 5 were placed and the Destructors could then simply be filtered to only collect the LivingRock.

This would make it much easier than the current complex method of block placers and breakers and chests and exporters.