Seraphaestus

I know if you punch dirt it does basically what you describe, although might not be as precise as you're thinking. Also not sure if it works on other terrain types.

At the minute, from what I've played of the game, the building is really fun but also really tedious. Not only are resources (logs in particular) slow to come by in the amounts you'd want for building, the solidification/hardening mechanic where you can't pick blocks back up is really dissuasive for building, in that it takes forever to break even single blocks once you've placed them down and the time has passed. My suggestion is to add a crowbar (craftable simply with iron, wood) that, when held, displays the option to pick up building blocks regardless of the time they have been placed (i.e. you can pick up hardened blocks with it). Hardening is a nice mechanic so you don't accidentlly interact with your structure building blocks once built, but breaking structures you've built is so, so tedious as it is. If this is a problem in terms of multiplayer pvp griefing, etc., then the crowbar could be disabled by default in multiplayer or be under a config so you can choose to keep it if on a server with trusted friends. If it's a problem with becoming overpowered from taking apart generated structures, these structures could have a tag that means they are only broken and do not drop again. Even this behaviour by default would be preferable in that it would remove the tedium of manually breaking each block with an instant crowbar dissassembly. Another thing I've noticed is that even within the time limit, it is impossible to pick workstations back up, as the option to interact with them overrides it, forcing you to break them. For example, I placed an alchemy stand in my house but afterwards found the noise was annoying and had to break it, losing the glass flask I'd used in its construction which is less than ideal. If you've got this far, thank you for reading my suggestion c: