Trying to use the Holder Theme...and its kinda sucking

Hey guys, wanted to have a landing page. Couple issues:

1. How do I change the word "holder" out. I go in the holder options and change the the header text, save changes, but no results when viewing.

2. The body of the holder theme seems to be limited to the size of the header...which creates weird outcomes. Wish this were not limited, and have an option for centering everything as that would create a more common user case outcome.

3. Header images are jpg..not png or svg...meaning they will suck when changing background.

4. Reach: Noticed that the theme options don't work inside the standard customize area, would be nice to have it all in one place and updated to normal standards.