“To add or remove multiple carets, you can also press and hold the ⌃ /Alt key, then click to add a new caret. You can also make a multiple selection by holding Shift+Alt and dragging the caret.”
In PhpStorm it's much simpler: just have to press Ctrl and up/down arrows. In WebStorm Ctrl and up/down arrows scroll up/down the opened file by one line. The only way to create multiple carets in Webstorm is by holding simultaneously Alt+Shift and selecting lines by mouse click (!). I want creating multiple carets to work in WebStorm just like in PhpStorm (Ctrl + up/down arrows). Where do I change that?