feature request: Expose secure param within UI

[Skelmis]

It'd be nice to have the ability to save pastes 'securely' without the need to modify the POST body. Thinking this could be via some form of toggle within the nav bar.

I am assuming however there are connotations and possibly more expenses to exposing this (more) publically so i'd be interested to hear your thoughts.
Alternatively it could be via a query parameter, essentially just something which doesn't require the need to modify the outgoing body