We discussed this at Per's (after you left, probably). We all agreed that it was a good idea, but there are some problems that need solving.
* Censoring the string should not be based on the flag in the string object. If it was, having a String.secure("hej") would prevent also non-secure "hej"s from being displayed.
* Therefore censoring would have to be based on a flag in the subtype field of the svalue, also set by String.secure(). However, subtypes are lost when the string is stored in a short svalue (such as a class variable).