Suggestion: add more short keys

[LonelySquid]

Hi! :)

I love your code but I would like to suggest adding more shortkeys like the [shift] button. I think it could really be handy to have it in the default option for everyone; even though it is easily added. ;) Have pasted an example below. Anyways, really awesome code and appriciate this plugin a lot!!

Yours Sincerely,

LonelySquid

scroll-through-time.js
enum: [ { value: "none", description: "No modifier key used" }, { value: "altKey", description: "Alt (Option) key" }, { value: "ctrlKey", description: "Control key" }, { value: "shiftKey", description: "Shift key" } ]