Create inactive cursors and selections with Place Inactive Selection command.
Activate the cursors and selections with Activate Selections command.
By default they are mapped to PageDown and PageUp respectively. If you need help in remapping them, check below.
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Feedback
For questions, suggestions, issues, feel free to use the Issues section of the extension's repository.
If you want to remap the commands
Open the Command Palette (Ctrl+Shift+P - Windows, Cmd+Shift+P - Mac).
Search for and select Preferences: Open Keyboard Shortcuts.
Once the Shortcuts tab is open, search for the desired command, in this case Place Inactive Selection or Activate Selections, double click on it and press the new key combination.
Notes
A cursor is actually just a selection which has the start and the end positions the same. This is useful to know further that when I'm saying "selections" I'm referring to cursors as well.
Other features
Placing multiple inactive selections at once is also supported.
To remove all inactive selections, simply press Esc.
If you place an inactive selection over another, the existing one will be removed:
If you discard the active selections, the inactive selections will reappear. This is because maybe you wanted to modify something about them, and this feature allows you to do that:
Behaviours
When you start editing the file, the inactive selections will be removed.
Extension limitations
These limitations are more technical and are handled to not constitute functionality breaking situations.