Most of the time we need to instance an object 3, 4, 5 times or more, and Shift+drag and drop its ideal.... Except we get this Dialog asking if we need copy, instance, reference or number of copies. That could be handy sometimes, but other times its just an extra click that could be annoying.
While this can be scriptable, I think multiple people could be interested on a global solution in max, where with Shift+control+Drag and drop (for example) we get an instance without any dialog, to make our life easier and faster.