Unlock could require some research first, instead of just a very easy trigger?

True, when originally making the mod I considered it, and then thought perhaps unlocking Ag towers, and killing a demolisher was enough, so it seems a fair price... part of the decision to unlock it behind a single small demolisher death was to give the player the choice - do I keep killing demolishers to get more tungsten access - or should I instead setup infinite tungsten worm farms... I suppose theres some logic to saying that it should be available before you have killed a small demolisher to make that choice have more meaning earlier - but also the idea of quality tungsten through the quality seeds mod with this one was also part of it all.