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Most of the other keyboard shortcuts mentioned are only useful for a limited number of line.
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The solution from of using SHIFT + ALT + i worked for me, when I needed to quickly edit ~20k lines in a file. Official VS Code Keyboard shortcut cheat sheets: You can view and edit keyboard shortcuts via:
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Or, as Isidor Nikolic points out, you can hold Alt and left click to place cursors arbitrarily. If you experience this issue, you can either disable the Intel/other software hotkeys, or modify the VS Code shortcuts (described below). Note that third-party software may interfere with these shortcuts, preventing them from working as intended (particularly Intel's HD Graphics software on Windows see comments for more details). On Windows, you hold Ctrl+ Alt while pressing the up ↑ or down ↓ arrow keys to add cursors.
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