We have config snippets (JSON/XML), a bunch of license keys or multi line licenses.
So we need masked multi line fields for this.
You could store them in text files, then attach the text file to the item? This doesn't work with the API yet though
Multilines custom field is now possible.
It can also be hidden.
It is committed in development branch and will be part of 220.127.116.11
Customer support service by UserEcho