When you ctrl+left-click a stack of modules into a building, it attempts to put the whole stack in. When you ctrl+right-click a stack of modules into a building, it attempts to put half of the stack in. If you are holding a stack of 50 modules, it's going to fill every module slot either way. It would be far more useful if the ctrl+right-click action placed just one module. It can be really tedious to open the UI of each mining drill just to place less than 3 modules.
edit: As of 0.17, you can now drop single items into entities with the 'z' key, or whichever key you use to drop items on the ground.
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PyroFire wrote:Also, we should be able to replace modules already in a structure when we go to place new ones in them, rather then only being able to replace with upgrades.
Also, please add a way to easily take modules out of structures. (you can't do this easily right now)