You should never edit theme pack official, but create your own theme pack. So that, never problem.
When a new option in theme pack, just chek changelog.txt in the official Theme pack.

All about creating your personal Theme Pack, with the name you want, is well explained in the Tutorial video by Gisuebos (i recommand you to have a look at all tutorial videos )

Tutorial videos : www.joomlic.com/docs/icagenda-tutorial-videos