From the docs:
In this mode, whenever you select anything it will "store" that selection and make it "sticky" so it stays selected.
You can move around in the document, edit it, and do whatever, just remember any selection you do it will get "sticky".
If you select a "sticky" selection again it will a deselect that selection and it will no longer be "stored" or "sticky"
You could use this in a hackish sort of way to create multiple insertion points: select the character to the right of each insertion point you want, and then when you've got 'em all leave this mode, press the left arrow key, and you're good to go. You could also edit the plugin or map these actions do different keystrokes (i.e. ctrl+i: "move characters 1 extend" to add an insertion point, then some key that leaves autoselect mode and also does "move characters -1").