Hi, is there a way to let Limesurvey save the "response thus far"?

All my surveys are "one page" as my type of application works better when respondents have an overview of the whole (so no next buttons). Furthermore I always have a "tell your story" field (long text) that some spend an hour or more on.

This means that however long I set the "expire session", some users loose connection or accidentally hit a browser button and ... loose it all.

So my Q: is there a way (or plugin?) that allows to do one or all of the following:

• Set a "save after ..." timer. For example 1, 5, 10 minutes.
• Let  the user hit a "save what I have now" button (not the save/resume option)
• A script or question option that says "save when user enters data in this Q".

Option 1 would be ideal, option 3 would be great and option 2 will work for some, but is also far from elegant.

I've searched the archive for "intermetiate save" and I know the "timer" option, but haven't found a solution so far.

For example, when the timer would have an option "save when time is up and reset duration" it would implement just what I need. It would allow to specify (just like with "next") that the response is saved.

Any help or suggestion is greatly appreciated

Have a nice day,

PS: I've used many versions of Limesurvey for the last 15 years, so I think my Q applies to all version.