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Description of problem:
Default zipl.conf has timeout=5, but that is not enough time to switch to a different kernel due to for example, boot failures from a debug kernel, i.e., typing "#cp vi vmsg" from the serial console takes longer than 5 seconds.

Version-Release number of selected component (if applicable):
s390utils-base-2.6.0-28.el8.s390x

Closing, we don't want to extend the boot times. I have managed to type the #cp ... command fast enough so it's doable :-) Also you can copy&paste a prepared text.