I said "arbitrary" because a number of editors like emacs or jetbrains IDEs have some sort of multiple cursors or square selection, but they just don work in simple way like ctrl+click to put them anywhere or allow breaking up the selection into lines ..."arbitrary" is not the right word, I know, I mean more like "multiple cursors done right" :)
Honestly, I can't remember finding a recent text editor that couldn't do it, TextAdept being the latest one. Sublime Text definitely has major selling points (in the sense of having advantages compared to other editors) but this is hardly one of them.
Can you tell of any IDE editor that has this? (Eclipse: nope, Netbeans: nope, all the Jetbrains IDEs family: nope, Visual studio: nope / actually there's one handicaped plugin to sort of do it in VS)
What do you mean by "arbitrary multiple cursors"? Do you mean the thing that all Scintilla-using applications (which Notepad++ happen to be one of) have?