I could use having the option to play a "checked off" sound when the step is completed or checked off.

Good suggestion, and shouldn't be too hard to implement.

Also, adding you as a contributor so that you can label issues and such :)

Working on this. If anyone has any suggestion for the sound (in and out of game), let me know! Using this: PlaySound("igMainMenuOptionCheckBoxOn") for now.

This is implemented on my forked version. Please, test it out!

Loaded in your changes. Thanks silvann!