yes -- it would be really helpful to have drafts saved (or even autosaved) -- I've "lost" half drafted messages too many times - yeah mostly my own stupid fault for navigating away from the page to check something - but making (commercial) software idiot-proof ought to be a mandatory design principle.
But given we haven't got it ... what I do is: select all and copy then, if its going to be a while I'll paste into a text document (e.g. in notepad).
We run free forum software, and Mike pays to host it out of the kindness of his heart (this forum doesn't support itself with ads or anything). We don't have the same commercial interests that the LM forum does to support some niceties.