Some years ago, I found an unofficial fan website in German and English. The address was http://dethkarz.go2web.net. It had a page with all (at least known to me) shortcuts for the various tracks and small as the site was, I offlined it.

Today, the site is no longer available, but for anyone interested checking it out, you can find it using archive.org's Wayback machine: https://web.archive.org/web/*/dethkarz.go2web.net
...or download the site here:
https://www.boud.it/dethkarz.go2web.net.zip

Using the latter option, you start it by opening default.htm and choose your preferred language, directly in German language opening gerframes.htm or for English: usaframes.htm

The site is only about 2MB

Edit: If anyone knows more shortcuts, please reply ... :)