While reading the cryptpad code, I have seen that my request kind of contradicts the feature that people might intentionally destroy documents so that others cannot read them anymore, e.g. burnAfterRead. But since this is my private server, this doesn't apply. However, it obviously means I have to change the cryptpad code in www/common/sframe-common.js and/or www/common/common-ui-elements.js and I am already testing some changes. If you have any hints regarding this, please let me know.