Tools to speed up your mining (pneumatic drills & fast mining drills), provide new resources (with dynamite or massive water injection) and even erase resources (with dynamite).
Mods introducing new content into the game.
New Ores and resources as well as machines.
Is there a version that only has the jackhammer?
Alternatively, how could I modify the code for that?
No, but the solution is simple : just do not craft or use the other tools... :-)