I don't think there is a way out of the box. However, a suggestion that comes to mind is to install Refit. Refit us designed to serve as a way to multiboot different OS. But there is no reason why you cant use it for just one OS.What refit does is that by default, it waits ten seconds to boot your default OS. You can configure that to a longer time though.
Check it out at http://refit.sourceforge.net/ and of course always do a backup before proceeding.
I know rEFIt, the developer is from Germany, too. But I totally did not think of using it for that! Thank you, this might just do the trick.
I will leave this thread open for a while just in case there are other suggestions coming in. It’s always good to have some options. And I can’t try rEFIt right now anyways, because it’s a remote server and I have to wait for its next scheduled boot. So if anyone knows about a more official way to accomplish this I’d be glad to read about it. If not, I will just use rEFIt.